Gavita Pro 1700e LED vs Luxx 645 LED Pro - Grow Room LED Comparison

As part of an extensive internal project to test and benchmark all of the LED grow lights we carry, we are comparing two heavy hitters in professional indoor cultivation: the Gavita Pro 1700e LED and the Luxx 645 LED. These fixtures are designed for serious, high-value crop production and are reshaping how modern hydroponic facilities approach lighting, especially in states where total electrical usage per facility is limited and efficiency is critical.

As LED technology has become more efficient and more affordable, it has quickly become the preferred option for maximizing yield per watt in professional grow rooms. Both the Gavita Pro 1700e LED and Luxx 645 LED are designed to push grams per watt to levels that were extremely difficult to reach with traditional HPS and other legacy fixtures.

Overview of the Gavita Pro 1700e LED and Luxx 645 LED

Gavita released the Pro 1700e LED and immediately disrupted the industry. In independent testing at Light Laboratory, this fixture came in at an impressive 2.76 µmol/J in the 380–780 nm range, making it one of the most efficient fixtures we have tested.

Shortly after, Luxx answered with the 645 LED, targeting the same professional segment and aiming to compete directly with the most efficient LED grow lights on the market. From a grower’s perspective, this comparison is essentially the Ferrari vs. Lamborghini of LED grow light performance—top-tier fixtures where small differences in design and features can matter depending on your hydroponic setup.

LED Grow Light Specifications: Gavita Pro 1700e vs Luxx 645

Below is a technical comparison of the two fixtures. Both are designed to cover up to a 5' x 5' flowering footprint and deliver high-intensity, full-spectrum lighting suitable for advanced hydroponic systems.

LED Specifications	Gavita Pro 1700e LED	Luxx 645 LED
Wattage (Input Power)	630 W	645 W
Voltage Options	120–277 V	120–277 V
Efficiency (µmol/J) [400–700 nm]	2.7	2.67
Total PPF Intensity [400–700 nm]	1,764 µmol/s	1,727 µmol/s
Amps	5.4 A @ 120 V | 2.7 A @ 240 V | 2.3 A @ 277 V	5.4 A @ 120 V | 2.7 A @ 240 V | 2.3 A @ 277 V
Recommended Mounting Height	8"–24" from canopy	8"–18" from canopy
Coverage Footprint (Veg)	7' x 7'	7' x 7'
Coverage Footprint (Flower)	5' x 5'	5' x 5'
Length	44.1" (112 cm)	49" (125 cm)
Width	43.7" (111 cm)	43.4" (110 cm)
Height	2.3" (5.8 cm)	2.6" (6.5 cm)
Weight	28.4 lb (12.9 kg)	31 lb (14 kg)
Warranty	5 years	5 years
Controllability	Yes, with Gavita EL1 or EL2	Yes, with Luxx Controller and onboard dimming knob
DLC Listed for Energy Rebates	Yes	Yes
UV and/or IR Spectra	Optional UV add-on (UVR)	No UV/IR add-on

In practice, the Gavita Pro 1700e LED offers a slight edge in raw efficiency and total PPF at a slightly lower wattage. The Luxx 645 LED is very close in performance, with a marginally higher power draw and a slightly more compact recommended mounting height range over the canopy.

Real-World Feedback: Gavita Pro 1700e LED Grow Light Reviews

Hydroponic growers and licensed facilities running the Gavita Pro 1700e LED report strong yield and efficiency gains in real-world environments:

• “We’re a licensed facility and changed out one of our flower rooms from 24 of the Gavita 1000 W DE’s to 24 of these lights. … The first harvest wasn’t that great, but that’s because we overfed our plants! Watch out when you switch. We overwatered. When you don’t have as much heat, the plants don’t drink as much… We’re a licensed facility and charged electricity is down 30%, our HVAC is probably down another 20%, and our yield is 5% higher. We dropped the LEDs within 18 inches of the plants. They love it.” – Carl, 2/28/20
• “This thing beams!! My plants are lovin it. If you throw it in a tent, make sure you have a 5' x 5' or larger. This thing is pretty big, but it fills the whole tent with uniform light, which is what I was going for. Super happy w/ this purchase.” – Norman G., 9/12/20
• “I finished my 1st grow with the lights about 2 months ago and got 3 lbs. and 5 oz per light in each 4 x 4 sq. ft area. They worked like a dream right out of the box and the grow went about perfectly. Now in my 2nd grow and 3 weeks away from finishing.” – thcfamer, 12/16/20

These reviews highlight several practical benefits for hydroponic growers: lower room temperatures, reduced HVAC load, significant reductions in electrical consumption, and yield increases when dialing in the environment correctly.

Real-World Feedback: Luxx 645 LED Grow Light Reviews

Luxx users report similarly strong results, especially with canopy uniformity despite the fixture using six bars instead of eight:

• “Love them! If I go with one brand I will be sticking with Luxx. I was worried about the 6 bars compared to the 8 on most but the PAR readings were actually really good throughout the canopy.” – Yellow Penguins, 6/17/20

The feedback suggests that even with a slightly different bar configuration, the Luxx 645 LED still delivers strong, even PAR distribution suitable for dense, high-performance hydroponic canopies.

Comparing Expected Yields from These LED Grow Lights

Both the Gavita Pro 1700e LED and Luxx 645 LED produce impressive efficiency and total output numbers. Under well-managed environmental conditions, growers frequently report yields around 3 lb (1,362 g) per fixture—equivalent to approximately 2.1 grams per watt.

Grams per watt is one of the most direct and meaningful metrics for evaluating a LED grow light. For perspective, achieving 1 gram per watt with a 1,000 W HPS fixture was considered excellent performance just a few years ago. Now, with these high-efficiency LED lights, growers are pushing beyond 2 grams per watt in well-tuned hydroponic systems.

Both fixtures offer a clear performance upgrade over older HPS, MH, CMH, and previous-generation LED lighting, especially when you factor in HVAC savings and compliance with power restrictions.

Spectrum Comparison: Gavita Pro 1700e LED vs Luxx 645 LED

The spectra of the Gavita and Luxx fixtures closely follow the curve of modern full-spectrum LED grow lights, with strong intensity in the blue, orange, and red regions. While the Luxx spectrum graph shows prominent peaks in specific wavelengths, both fixtures appear white to the human eye with small clusters of red diodes—nothing like the heavily red-and-blue fixtures of older generations.

From a practical grower standpoint, the spectral differences between the Gavita Pro 1700e LED and Luxx 645 LED are negligible. Both use up-to-date spectral design aimed at maximizing yield, quality, and overall plant performance in professional hydroponic operations.

Gavita Pro 1700e LED Spectrum:

Luxx 645 Pro LED Spectrum:

PAR Grid Comparison and Canopy Uniformity

PAR grid charts give a more concrete picture of how these fixtures perform over real grow footprints. The Gavita data below comes from our own testing, while the Luxx data is factory-provided. Note that the measurements were taken under different conditions, so this is not a strict apples-to-apples comparison:

• Gavita Pro 1700e LED: 24" above a 5' x 5' coverage area
• Luxx 645 Pro LED: 12" above a 4' x 4' coverage area

Gavita Pro 1700e LED Grow Light – 24" above a 5' x 5' footprint:

Luxx 645 Pro LED Grow Light – 12" above a 4' x 4' footprint:

Despite the different test heights and footprints, both fixtures demonstrate strong, even PAR distribution suitable for dense flower canopies. In larger hydroponic rooms, this kind of uniformity simplifies irrigation and nutrient strategies because plants across the canopy are receiving similar light intensities.

Cost Comparison: Gavita Pro 1700e LED vs Luxx 645 LED

Below is an approximate cost comparison between the two fixtures, including controller-related components and estimated monthly operating costs at a U.S. average power rate of $0.13 per kWh.

	Gavita Pro 1700e LED	Luxx 645 LED
Estimated Fixture Cost	$1,100–$1,300	$1,000–$1,100
Adapter for Controller	$100–$150	N/A
Controller	$300–$400	$300–$400
Estimated Monthly Cost to Run @ $0.13/kWh	$29.48 @ 630 W	$30.19 @ 645 W

The Luxx 645 LED generally comes in at a slightly lower fixture cost and does not require an additional adapter for controller integration, which can reduce upfront investment in large-scale deployments. Monthly operating costs between the two are very similar, with the Gavita drawing slightly less power and the Luxx drawing slightly more.

Key Takeaways for Hydroponic Growers

For hydroponic growers deciding between the Gavita Pro 1700e LED and Luxx 645 LED, the data points to a few clear conclusions without changing the underlying results:

• Efficiency and Output: The Gavita Pro 1700e LED offers a very slight edge in µmol/J and total PPF at a lower wattage, but both fixtures deliver top-tier efficiency and intensity appropriate for commercial hydroponic flowering rooms.
• Yield Potential: Under optimized conditions, both fixtures are capable of helping growers reach around 3 lb per fixture (roughly 2.1 g/W), a major jump compared with many older HPS and legacy lighting setups.
• Spectrum: Spectral differences are negligible in real-world use. Both fixtures use modern full-spectrum design with strong blue, orange, and red output for vigorous vegetative growth and dense flowering.
• Environmental Control: Growers report reduced heat load, lower HVAC demand, and improved control over VPD and irrigation—critical advantages in tightly controlled hydroponic environments.
• Cost and Control: Luxx offers a modest advantage in fixture + control hardware cost (no adapter required), while Gavita brings slightly higher efficiency and the option for a dedicated UV add-on.

If you are running a hydroponic facility and looking to replace older HPS, CMH, or early-generation LED lighting, either of these fixtures represents a serious upgrade in grams per watt, environmental stability, and long-term operational efficiency. The final choice often comes down to budget, preferred control ecosystem, and small layout considerations in your grow room.