Tips for Hanging a Grow Light in Your Closet

Turning a closet into a grow room is an ideal choice because it's secluded and out of the way. You are not wasting an entire room of your house for cultivation. Instead, you have set aside a small and sufficient space to practice indoor gardening. One of the first steps you’ll want to undertake for converting the space is to hang grow lights in your closet.Turning a closet into a grow room is an ideal choice because it's secluded and out of the way. You are not wasting an entire room of your house for cultivation. Instead, you have set aside a small and sufficient space to practice indoor gardening. One of the first steps you’ll want to undertake for converting the space is to hang grow lights in your closet.

Here are a few tips on hanging a grow light in your closet...


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Hortilux SE Ceramic HPS 600w Grow Light Test & Unboxing Review

The Hortilux SE Ceramic HPS 600w Grow Light gives you that amazing spectrum that ceramics give you along with the intensity of the high pressure sodium 600 watt. So what I want do is turn it on and kind of show you guys the spectrum and what to expect out of this thing because it’s able to actually put out a much wider spectrum than a normal 600 watt HPS lamp and it encompasses a lot of the reds and it looks almost white to the eye, but you also still get a lot of blues in it.


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Ceramic Metal Halide CMH 315W Lamp Comparison Test Data & Review

Download the Zoomable PDF HERE: CMH_COMPARISON1.pdf

Prism Lighting Science Instagram Check Out Prism Lighting Science Instagram for Growing Pictures

Hey everyone Nate with Growers House here and we just wrapped up our test on 315 watt Ceramic Metal Halide Lamps. Were trying to tease out which lamp available in the market is the best for growing plants. I scoured the market and got my hands on every single 315 watts ceramic metal halide lamp I could, with the intended use of growing plants of course.

We ended up with 10 bulbs and from those ten bulbs we put them through a battery of tests trying to keep all variables constant except for one. Our aim was to record the spectrum of these bulbs and get as much data as possible - data we can then pass on to you. Data to help you to make a decision on which lamp is going to be best for your grow, whether its the best output, the right spectrum or just the best value. That decision is totally yours,  we just want to provide you with all the information that you can use to make an educated decision. But first, a lot of people don't know about ceramic metal halide lighting, what it is or where it came from. First, just looking at this lamp you can see it's pretty small and has a different kind of socket than the usual Mogul style socket and requires a specially designed 315 Ceramic Metal Halide Reflector and or an CMH Bulb Adapter and enabled to be able to use them.

I want to first and foremost lets clarify one point - CMH is NOT a Metal Halide Lamp. Most people think Metal Halide Lamp, "I know what that is.. ok this lamp is made for veg."

No, that's not true. Lets take a look at a Metal Halide Lamp. A CMH lamp has a different emitter than a normal metal halide lamp, which is built of Quartz.  Inside a CMH there is a ceramic component. So the difference is this - A ceramic tube is able to withstand much higher temperatures. Many manufacturers are saying the higher arc tube temperatures happening inside the lamp allow for more color stability, better lumen per watt ratios and effectively an all around better bulb in comparison to the HPS metal halide. We're talking about how many photons of light you're getting to your plant in the usable spectrum per watt of input, which is really the way you want to measure efficiency for your lamps.

CMH lamps burn just like a normal Metal Halide Lamp. There are salts inside of the arc tube that heat up to a high temperature and that give off a certain spectrum. But, since the salts inside a CMH are able to heat up to much a high temperature they're actually turned into what resembles plasma. Plasma burning at this higher temperature has the effect of providing a spectrum that is much wider and better than traditional HPS or metal halide lamps.

So that's why these ceramic metal halide lamps are so popular these days because people are looking for the little edge in getting every efficiency of their garden possible and to be honest, Ceramic Metal Halide is kind of the new wave of the future in terms of getting there. So let's jump into some of these results that we have I want to show them to you because we got a little data crazy, doing some different spectral analysis some bar graphs and of course some light layout measurements and we also came up with essentially our own graph of what we think the best value is for your garden in terms of overall output and price.


Starting off looking at the spectrums of these two different lights, really there are two categories of ceramic metal halide lights. Approximately 3,000 Kelvin and approximately 4,000 Kelvin, with the 3000 Kelvin you can see that most of the intensity of the light is focused around about 600 nanometer range, that's where its strongest and you see that like really Orangish almost Yellowish Hue you see along with HPS light, so that's why it looks a little bit Orange to your eye and you also see when you get up more towards the IR there's a pretty big spike there just north of you know close to north of 800 nanometers and then it drops off and there's not too much past 900 nanometers.


Now if we look at the 4000 kelvin spectrum you'll notice that it actually looks a little bit more full that's because the spectrum is a little bit more broad but when you compare these two, what you can't really see is that the 3k is more intense, but the 4k has a little more of a broad spectrum. So that broad spectrum you see is a little bit closer to like the I would say its peak is closer to around that 500 range and that's why you see the light a little bit more as like a white light or even what people call blue light which more resembles even like your metal halide and usually out of the 4200 Kelvin lights you will see a little bit more going into the UV range although when we did some testing we did see that UV is were actually pretty high and some other 3k lights as well.


For this test our measurement of UV is relative- by measuring the intensity of the light between 250 and 400 nanometers and that range is primarily going to be focusing on the UVA and UVB these lights give off. The light that did best in terms of UV was the Ushio 3000 Kelvin CMH Lamp which was a little bit surprising and then the next up was the Nanolux MaxPar 4200 kelvin CMH Lamp. So working your way down you'll see that the difference between the lowest bulb and the highest bulb isn't significantly great I mean these are relatively low numbers if you're thinking of par so I wouldn't say that these lights are a very strong UV performer but they do provide some UV indeed but the range between six and eight point six for light of this size actually you know 315 watts is actually really not that bad, but if you’re looking for max UV I'd say go with that Ushio.


We made our PAR footprints to show how this light performed in a Sun System 315 Watt LEC Fixture on 120 Volt so keep in mind the inside of that fixture has some pebbled aluminum in it.


Our footprints which show a center readings for five sizes. 1x1, 2x2, 3x3, 4x4, 5x5  and the par readings at each one of those points. Keep in mind the pebbled aluminum aluminum can kind of shoot light in different directions it can scatter it a little bit. So really when you're looking at this don't take the Center reading as gospel, really the most important thing is to take as many measurements as possible and in this case when we take the measurements of each one of those parameters and add them all up and gives you a much more well-rounded story of how well this lights producing in the whole I mean when you're testing lights on a very very scientific level like with the best instrument instrumentation available using an integrated sphere and you're measuring basically every single, I mean we're talking multiple thousands points you're measuring with here we're doing you no more than 30 so you can see if you're looking at the center I mean the highest reading that we all have any light here was the Phillips 3100 Kelvin CMH Agro Lamp and it was pretty consistently the best across most of the readings. Taking that into account you know take a look at this noting which fixture it's in so that's the kind of spread you're going to get but of course when we do our testing we try to hold every variable constant except for one and that's what we’re testing for which in this case would be the bulb. So we used the same balance same height same reflector in the same ten you know everything was held to a standard where we feel like it was getting a to the point where pretty scientific.


Our part charts graphs includes the sum of the perimeters of each one of the 1x1, 2x2, 3x3 and 4x4 but the one that I want everyone to pay attention to most is the sum of all par for the 5x5 print because that's the one that takes the largest sample size of measurements into account. From the results of the 5x5 you can see that the Philips MasterColor 3100 Kelvin CMH Lamp was looks like by far probably the best overall CMH bulb available. It had the highest reading of all the measurements for PAR and when you look at the 4200 Kelvin version of the Philips CDM Elite 315W bulb did the best as well you know I mean going into this if I had to have a hypothesis I would say that Philips Elite 315W Brand would be my guess for the best bulb. Probably because Philips is company that designed and developed the 315 CMH lamp originally, perfected what kind of ballast to use with it, how it would work properly and their compatibility of the two both in Hertz and the wave type of the ballast so I would say kind of no surprise there.

Although it is a little bit surprising that Philips Ceramic MH Lamps did approximately eight percent more than the next best bulb which would be the SunPulse CMH 3200 kelvin bulb. The differential between the Philips CDM Elite 315W bulb @ 4200K and the next best 4200 k lamp looks like the Nanolux Max Par 4200K CMH Lamp is just under five percent.

We hope you can take these readings use them to make an informed decision on purchasing the best 315W light for your purposes you know 315 watt ballast and are relatively similar so which one you go with won't probably have a huge differential but it looks like these bulbs you can tease out that there are some differences so use the one that other was the most you be or the most intensity or the best spectrum with this information and if you have any questions for us please give us a call or send us an email and other than that, this is Nate from Growers House. Happy growing.

Download the Zoomable PDF HERE: CMH_COMPARISON1.pdf>

1000W Double Ended MH Comparison Test

1000W Double Ended MH Comparison Test


Video Transcript:

"Hey everyone, Nate from Growers House. We're doing our newest review test which is the Double Ended (DE) Metal Halide (MH) [1000w] shootout. There are two companies in the space. We wanted to see what they had to offer, what their spectral distribution looks like,  so we can really compare these lamps against each other and go over the pluses and minuses of both. There are two companies in the market at the moment (for MH DE), MaxPar which is engineered and distributed by Nanolux and then Solis Tek. If you take a look at these two lamps, you'll see they look quite different.

DE MH Lamp side by side at growershouseSolis Tek on the left, Nanolux MaxPar on the right. These are both 1000 watt Metal Halide (MH) bulbs. Both in the 4K versions. What you'll see here is that the Solis Tek doesn't have whats called an outer jacket that Nanolux Maxpar has on their double ended metal halide lamp. This outer jacket is something that's completely new, patent pending design by Nanolux and their engineers. MaxPar made this outer jacket because they wanted their bulb to ANSI and NEC standards. Sometimes when metal halide bulbs go out, they burst, and so they wanted this borosilicate glass over the quartz to make sure you're protected in that way. I talked to Solis Tek about that and they said they designed their bulb--even though it doesn't have the outer jacket--that it is safe to use.

Mainly when we're talking about safe to use we're talking about open rated fixtures vs. closed fixtures. Closed fixtures are like your normal air cooled fixture that has a glass lens that totally keeps the bulb enclosed. Whereas something like a Gavita or a Solis Tek A1 Double Ended DE Complete Light System 120/240V are reflectors that doesn't have any glass is an open rated fixture. We at GrowersHouse ran both of these bulbs in both style of reflectors, they are both quality bulbs, both companies recommend you can use them and in either open or enclosed fixtures they just have a different way of going about it.

maxpar4k_DE-MHNow when we test these I would imagine that some of the features are little bit of give and take. What you might gain in a little bit of safety on the Nanolux MaxPar double jacketed design (we will see under our spectrometer) but we'll see if that design changes in either the spectrum or the intensity. It could be a bit of a trade off.

So that's why we're here to really figure out today and will bring out all the bulbs in their entire lineup. Solis Tek has a 4K, 6K, and a 10K. Nanolux MaxPar has a 4K and 6K. When we say "4K" we are refering to Kelvin. The Kelvin scale (Color temperature of mesured light energy. Higher the color temperature the closer the light source is to the blue end of the spectrum. The lower the Kelvin temperature the closer the light source is to the red end of the spectrum).

The 4K lamps you can use for vegetative growth but you could also use for flowering. It's a little bit of one size fits all bulb. Whereas the 6K is a dedicated vegetative bulb that gives you more of a blue spectrum that's much better for a plant to have shorter inter-nodal spacing for its leaves and offshoots and at the same time give you a little more foliage and growth so your plants have more node sites for flowering.

SolisTek 10K DE LampSolis Tek has one added lamp selection, the 10K Finisher made for the end of flowering. Solis Tek recommends using this the last two weeks of flowering because there's a high amount of UV. The high amount of UV is going to mean that when you measure PAR (which is the intensity within normal realm of wavelengths that plants use to photosynthesize) the UV doesn't show up there. If you measure the 10K bulb under any PAR meter it's going to be quite a bit lower intensity than your normal for 4K, 6K, or HPS. Where it makes up for that is a little more intensity in the UV range. This 10K lamp at the end of flowering stresses out the plant's a little bit but it's a good type of stress because it causes plants to produce more essential oils which is what a lot of people are looking for. Lets see our test results.

DE  MH Test Spectra Graph

Looking at the spectral charts of these bulbs first we'll start off with the 4K. You'll notice that both of these bulbs are giving off the same spectrum (4,000 Kelvin) mainly for vegetative growth but can also be used for flowering. You can see that they closely match each other and if you look at the spectrum is really you just see that some points the SolisTek just eaking out the MaxPar little bit, but actually in a few other peaks the MaxPar has the highest point we would say these are very evenly-matched spectrum's.

DE  MH Test Spectra Graph

The 6K charts show similarity also, but you see the SolisTek and MaxPar peaking in different areas. The highest peak at about 590 nm is the MaxPar just a little higher than the SolisTek and in some of the lower blue peaks the SolisTek is eking it out. But overall you can see how these spectrums are very similar. If you go over to the UV all the way on the left you can see that's where that at 350-400nm around there you can see the SolisTek is eking out the MaxPar just a little bit but really these pictures are so similar.

DE  MH Test Spectra Graph

The Solis Tek 10K Lamp you'll notice over at 350-400nm the UV is much higher than the 6K which is what we would expect this is a finishing bulb made to have really high UV.

DE  MH Test Spectrum Chart

For these bulbs, so we measured the intensity of not only the normal light but also of the UV. Just as the spectral graphs showed, the intensity of the UV spectra for that 10K is up and above all the other bulbs quite a bit of at 43. Versus the other bulbs which are down, the 4K 6K are about 26 umols, and the MaxPar 4K at 23 umol and the MaxPar 6K at 21 umols. SolisTek did a little bit better in the UV but they're pretty close within a 10 to 20 percent difference in the MaxPar Nanolux.

In the lower portion the overall intensity that's where it actually flip flops a little bit with the MaxPar giving out overall slightly more intensity in the PAR which is the 400-700 nanometer wavelengths that plants use lights most efficiently to photosynthesize. Where the 4K SolisTek was at 1106 μmol the 4K MaxPar 1120μmol. The 6K SolisTek was at 950 μmol the 6K MaxPar at 1052 μmol so a little bit of a greater difference with the 6K than with the 4K that was very close.

The 10K is down at 925 μmol, this is an important thing to notice, that 10K down at 925μmol has a lot of its energy focused on spectra that's outside of the 400 to 700 nanometers range. Namely some of that UV and IR really are focusing on the UV in the sub 400 nanometers that's why you see the intensity of the umol go down there.

These are really interesting findings, we hope it helps you choose a lamp that's the best for your operation based on UV light and intensity. Both the Solis Tek and the Nanolux MaxPar MH bulbs can be used in basically any DE Double Ended fixture at this point.

If there's any other information you'd like to see please send us an email at staff@growershouse.com

-Happy Growing!"

Double Ended Metal Halide Graphs Master Data Excel File *Click Here To Download*


Digilume 1000w Double Ended DE Complete Fixture

Urban Horticulture Supply LogoHey everyone Nate from Growers House here,  I'm here with bill the owner of UHS Urban Horticulture Supply  an indoor garden equipment manufacturer and distributor who just came out with a very unique double ended lighting fixture [Digilume 1000w Complete Fixture] that he personally brought down to us we could test it under our spectroradiometer. He actually built this in conjunction with a high end light facility. Because we do a lot of testing of other lights we wanted to see how this light compares.  We did a video because this light tested very well. A little bit of the background with this light, about what it can do? Bill will talk a little about it, how did it first come about?

Bill- Well basically what we did we felt we needed to have a fixture that was better than the competition so the first thing we had to do was take a look at the industry leaders such as Gavita and ePapillon the two major brands of double ended lighting for the horticultural industry.  We did a lot of tests to see what we could get at all different heights over the plant canopy. We set out to design a superior product specifically to other similar fixtures. The way to create demand for a brand like Digilume we have to have a product that is superior.  So we took those test results at different heights and tried to determine what the benchmark was for other fixtures. Giving us a goal to beat. After designing back and forth for a few months and rigorous testing and redevelopment, we got test results that are suitable for us to put out a significant amount of PAR above the current competition.

Nate- So from what I understand Digilume  is designed to be an indoor light as opposed to the Gavita or ePapillon which were designed for greenhouses and their footprints were designed for that use. The Digilume is designed to hang about 36 to 48 inches above the canopy as a primary lighting source for indoor applications not greenhouses


Bill- That's correct. We recognize the trends in other climates or parts of the world other lights work as supplemental lights for greenhouses but for north America most of the commercial setups are being designed for indoor use in a non-greenhouse environment. The funny thing is these commercial setups primary lights in indoor facilities are being outfit with lights like Gavita and ePapillon that were designed to be supplemental lights for outdoor greenhouses. It's backwards. We wanted to design a light designed specifically for indoor application.

Nate: I must say when I first looked at this light I thought I looked kind of peculiar. It has a long reflector that is kid of parabolic in shape. I was curious how it was going to test. And this is a high frequency ballast that goes up to 1150watts just like other standard DE fixtures these days.  The cool thing is seems like the intensity and distribution came down a lot more intense and a lot more even than I would expect from a reflector like this. You mentioned this reflector can be substituted in for a Gavita fixture if you wanted to?

 Bill- We did a few things differently with the Digilume DE. You're right you can take this fixture here with 98% reflective German aluminum the best aluminum you can get on the market. This fixture not only had better light output but can be used in universal applications in the horticultural industry with other products that are already on the market. So yes we are able to fit no only the Digilume reflector arm but also the Gavita reflector arm and a few others.

Nate. That's great. Price point wise you guys are able to get in there at not only the same price but a little better than the competitors out there?

Bill- Yes that's right we have very competitive pricing we already have pre orders for thousands of these units for mostly larger commercial setting but also medium sized commercial settings so we are able to get the prices down. And be more cost effective not crushing the price but quite a bit less than the competitors

Nate- that's good, I mean if it performs better and it's a lower prices it is going to well in the marketplace. I can you guys we tested this before we filmed this video and the results are really good. This is the best double ended fixture we have yet to test at our facility. Check out the results with a spectral graph and the par measurements over the 4x4 Foot print at different heights.

Digilume DE Spectrum Chart

Nate- The results for the Digilume DE, it did extremely well. This unit, at center par has the highest readings we've ever recorded for an indoor growing light.



Comparing it to the last DE list 1000W test we did with the ACDE, Adjust a Wing, the ePapillon, a Gavita Pro and the Magnum XXXL. Compared to a Gavita light this light is throwing out more intensity over the 4x4.  There are only a couple spots on the out perimeter where you see the Gavita does better but it seems likes this reflector design is really pumping the light directly over your canopy. The only light that we feel like really compares is the SunSystem ACDE which the best light reflector we tested last time and that light was slightly less intense in the center but had slightly better overall distribution on the outside perimeter. But you hang a lot of light in a room it's tough to see which light is better. When you consider what you need if it air cooling or want a complete fixture. Keep your eye on this one, we think we will see a lot of grow journals talk about this light and what kind of performance it's putting down as far as plants putting out quantity and quality.

This is Nate from GrowersHouse with another cool light to the indoor growing industry. Have a good one.>

What Indoor & Greenhouse Grow Light Fixtures Are Most Economical? A Look at the Bugbee Model

Crop scientists at Utah State University recently released a study that is generating a lot of buzz in the indoor gardening, hydroponics, and greenhouse market. The scientists measured the photosynthetic (400-700 nm [PAR range]) photon efficiency and photon distribution patterns of double-ended HPS lights, LEDs, Fluorescents, Induction, Ceramic Metal Halide, and standard mogul base HPS lights [they measured popular indoor garden lights such as the Gavita Pro 1000w Complete Double Ended, ePapillion 1000w Double Ended, LSG Violet, SPYDR 600, LSG red/white, Illumitex NeoSol 300w NS, Lumigrow Pro 325, California Light Works Solar Storm 400, Black Dog BD360 Universal Series, Apache Tech AT120WR, iGrow 400w Induction Light, Lumigrow ES 330, and HydroGrow Sol 9, Cycloptics Ceramic Metal Halide, Fluorescent T8 fixtures, and mogul base 1000w HPS fixtures]. The study also took initial cost of the fixture and electrical costs to conclude that LED and double-ended HPS lights were the most efficient lights out of the bunch, with double-ended HPS slightly ending out LED.

The way this test calculates the economics of a lights efficiency is by factoring in the initial capital cost of a fixture and the cost of electricity to operate it over a 5 year period and comparing that to the amount of photosynthetic photons (light that plants are known to use to photosynthesize) they deliver.

Over a 5 year timeline, the study found that when you factor in electricity and fixture cost per mole of photons, LED lights are approximately 2.3 times more expensive than HPS fixtures to operate. This brings about another interesting question, which is how will that multiplier of 2.3 change as LED technology keeps progressing? As LED technology keeps getting less expensive and more efficient, by what year will that 2.3 multiplier dip below 1 making LEDs more efficient to run than HPS lights, in turn totally changing the standard for indoor grow lights from HPS to LED.

The hard part about doing a test like this is that measuring light efficiency can never be absolute. What I mean by that is that there is no one light that does everything a plant or specific garden setup needs. Some plants grow larger and taller than any one fixture can satisfy, and some are small enough that much light may go unused. Also, garden setups may have long skinny rows, or may be designed in some way that's completely different. For example, LED lights have optics that can be manipulated to have a specific coverage area, while HPS lights need reflectors to perform that function, and reflectors are often less precise. So although this test found that LEDs are more expensive over a 5 year period when all emitted photon radiation is assumed captured by plants, when a more narrow region is considered to be captured below the fixture (for example on flood tables or benches) some LEDs in the test actually had a lower cost per photon than HPS fixtures. So a HPS light emits more light, but the LED lights have the potential to be better at taking their energy input and directing it over a small, specified region. Results like this don't make choosing a light quite as easy as we had hoped.

We have to remember when looking at studies like this that they don't tell the whole picture for most of us indoor growers, and we can't expect it to. Tests like this need to set parameters, assumptions, and measure variables accurately. Throwing more variables into the equation, such as cooling the environment and its associated costs, throws in added complexity. If you're feeling extra nerdy, read through the PDF of the academic write up below to view this information in all its detail. We look forward to more universities providing insightful information like this to help us make important purchasing decisions for our gardens rather than having to rely on marketing claims, which can often be misleading and inaccurate.

Lastly, one of the coolest and most useful things to come out of this test is a cost calculator that helps you compare light fixture cost over a 5 year period. A great resource that you can download here: Five-Year Cost Calculator for Grow Light Fixtures Excel File

This is Nate from Growers House. Happy Growing.

Bugbee - Economic Analysis of Greenhouse Lighting_ Light Emitting Diodes vs. High Intensity Discharge Fixtures PDF Download


1000W Hortilux HPS Bulb Spectrum & Intensity as Wattage Changes

Click Here to View Spectral Chart Infographic PDF

View the Spectral Chart Infographic PDF

Hi everyone, Nate from Growers House here. Today were going to be doing was brought up by one of customers as a really good question. This customer normally uses a 1000W ballasts, but he wanted to see what happens to the bulbs spectrum and intensity as he dials this ballast down from the SuperLumens feature, 1000w, 600w and down to even 400watts. In particular he was using a Solis Tek ballast and a 1000w HPS bulb from Hortilux so we thought, why not throw these guys under our spectrometer and see how the spectrum changes as a 1000 watt bulb is ran at different wattages not only that but how does the overall intensity change and are there any deficiencies or inefficiencies that are gained by running a 1000w bulb at 600watts. And is the intensity linear or maybe exponential in how it decreases.

We will be using our new spectroradiometer, The Black Comet from Stellar Net which we are now using to do all of our spectral readings and par readings. Rather than using our handheld par meter we used before. Which is great par meter for standard uses, but we found that the meter we were using is not optimal for producing the kind of data and specific accuracy we wanted for our tests. (the hand held we used had a plus or minus 5% on readings depending on the type of lighting you were using led, hps, hid MH, CFLS) with this new very sophisticated Black Comet spectrometer we are able to take accurate measurements and calibrate each time we take a light measurement to get the most accurate light reads possible. This is university research grade equipment and we are really excited to be using it and get some really useful data out of it. So let's take a look at our results.

So using the Solis Tek Matrix 1000W Dimmable Ballast with a Hortilux Super HPS Enhanced 1000W bulb with a Growlite Karma 8 inch Air Cooled Reflector which has panels that cover the air cooled ducting and we thought it would put a nice even footprint over the space let's see we tested this bulb in every wattage setting in the Solis Tek Matrix it has 6 total wattage settings, it has 1000, 600 and 400 watt setting and then it has a Super Lumen setting for each one of those settings, bring them up to 1040, 630, 420 respectively. We also measured the voltage and we tested this at 120 volt the wattage at the wall for each setting and the amperage, all at 60 hertz, and we came up with a ratio of PAR/ watts this center par reading is really right below the fixture at approx. 24inchs above the light meter we measured the light intensity in micromoles. and we came up with the par / watt ratio so you can see how much usable photosynthetic light you are getting per watt of input, there is a pretty good correlation between when the ballast is operating at higher wattage its actually more efficient at putting out usable light for your plants. As you dial your 1000w bulb to 600 and 400 watts you'll actually be losing some efficiency you'll also be losing some wattage. We thought that was a good way to see the efficiency of the lamp.

If you zoom into the spectral chart you can see the differences in the spectra from each wattage setting. You can see the differences for each settings compared to its super lumen setting. What we thought one of the most interesting things was how the graph actually changes as you go from 1000w to 600, you'll notice the lamp does not cover as wide of a spectrum when you change down the setting from 100w to 600w and even from 600 down to 400. S so what you're getting is really a narrower spectrum as you're dialing your ballast down to lower wattages. You can see at the 1000w you're getting much more broad coverage which you would think is more beneficial to plants with more photosynthetic capability.

Lastly we made a graph showing just the three 100, 600 400 settings so you can more easily see how their curves change and also one for just the super lumen settings.

We had a lot of fun doing this test, it taught us a lot about how these bulbs output can change with changing the ballast.

If you have any other tests you'd like to see put it in the comments here or email us or call us- This is Nate from Growers House, Happy Growing!>