PLS 315W Ceramic Metal Halide CMH Grow Light Conversion Kit Unboxing & Review

PLS 315W Ceramic Metal Halide CMH Grow Light Conversion Kit Unboxing & Review

Turn Any HPS or MH Grow Light into a CMH 315W Grow Light: 315W Conversion Kit

Hey everyone—Nate from Growers House here. I’m walking through a simple way to step into ceramic metal halide without buying a whole new fixture. If you’ve got a single-ended HPS or MH reflector lying around, this CMH 315W conversion kit lets you run a 315W CMH lamp with the gear you already own. No drama, no guesswork—just a clean upgrade path.

BLOG_PLS 315W CONVERSION KIT

Who Is This For?

  1. Growers with older single-ended reflectors who want to turn them into 315W CMH reflectors.
  2. Anyone who has a favorite single-ended MH/HPS reflector (mogul socket) and wants to use it with CMH lamps.
  3. Folks who prefer open/bare-bulb hanging with 315W lamps and want a reliable, compact setup.

What’s in the Prism Lighting Science 315W CMH Light Conversion Kit?

At the time of filming, this combo was exclusive to Growers House because we put the components together specifically for growers who want a budget-friendly CMH option. The kit centers on two core pieces:

Choosing the Right 315W CMH Lamp

You can pair the kit with the 315W CMH lamp of your choice. Our recommendation: the Philips 315W CMH lamps, which tested among the best for overall output in our comparison work.

  • Philips 3100K: Great for full-cycle use (veg + flower) or flower-only thanks to a fuller spectrum.
  • Philips 4200K: Ideal for propagation and veg, with more blue in the spectrum.

How the Conversion Works (Simple Steps)

This part is easy. Take the 315 CMH bulb, screw it into the 315-to-mogul socket adapter, and then screw that into your existing single-ended reflector. Plug the ballast into 120V or 240V, and you’ve converted your familiar reflector into a CMH setup.

Cost Advantage vs. Full CMH Kits

Most complete 315W CMH grow kits land in the $300–$500 range. By using your existing single-ended reflector and this CMH 315W conversion kit, you can get running for under $200 including the lamp—significantly lowering the barrier to entry.

Why CMH? Spectrum, Sun-Mimicry, and Plant Response

CMH (ceramic metal halide) is popular because its spectrum better mimics natural sunlight, covering more wavelengths than typical HPS or MH. That broader, more balanced spectrum supports robust plant growth across stages. Another plus: CMH lamps output meaningful UV, which many growers value for its association with enhanced resin production.

Versatility: Use the Reflector You Love

Want to air-cool your 315W setup? Go for it. Want to dust off a favorite reflector from the garage and put it back to work? This is the quick route. The adapter preserves your reflector choice while unlocking CMH performance.

Practical Use Cases

  • Converting a trusted single-ended reflector to CMH without changing your room layout.
  • Open/bare-bulb hanging for compact canopies or tight spaces.
  • Veg rooms that benefit from 4200K CMH blue-rich spectrum.
  • Full-cycle tents or flower rooms using 3100K CMH for a fuller spectrum.

Results & Conclusions for Growers

Results (what you can expect): Access to CMH-quality spectrum with your existing single-ended reflector, a budget-friendly path into 315W CMH, and an easy install using the socket adapter and dual-voltage ballast. When paired with Philips 315W lamps, you’re getting strong output and a spectrum that supports healthy veg and flower, with UV that many growers associate with better resin expression.

Conclusions (why it helps): If you’re hydroponic and optimizing light quality per watt and per dollar, the CMH 315W conversion kit is a smart upgrade. It reuses equipment you already trust, reduces upfront cost compared to full CMH kits, and delivers a balanced, sun-like spectrum that can improve plant development across growth stages.

Key Takeaways

  • The CMH 315W conversion kit lets you convert HPS to CMH using your single-ended reflector.
  • Dual-voltage 315W CMH ballast + 315-to-mogul adapter = plug-and-grow simplicity.
  • Choose Philips 3100K for full cycle/flower; choose Philips 4200K for propagation/veg.
  • Expect strong spectral coverage and UV, often linked with improved resin production.
  • Enter CMH for under $200 including lamp, instead of $300–$500 for many full kits.

Final Word from Nate

I like solutions that respect a grower’s existing setup. This is one of those: minimal parts, maximum flexibility, and a spectrum that’s hard to beat. If you’ve been curious about CMH, this is a low-risk way to try it with your current reflector—and actually see what the spectrum does for your plants.


Back to blog