Best Grow Light for Growing Cannabis in 2020



Link to 630w CMH: What exactly is the best grow light for growing cannabis? There is an insane amount of misinformation floating around …

35 responses to “Best Grow Light for Growing Cannabis in 2020”

  1. i am running 2 315 w cmh no complaints here, leds seems to expensive but the cmh quality of the flower is what makes them better plus you you use less watts compared to a hps light.

  2. Not true. And the fact that you get money from the CMH company confirms this. LEDs are better than CMH. LEDs can have UV and IR lighitng in them. I think you're just going off of cheap Amazon lights for comparison. This is NOT correct information at all and I can send you to a video with a horticulture scientist that proves LEDs are better than CMH

  3. I built a 5.5'×5.5'×8'h room in my garage with a Phantom CMH 315w ×2 light plus two Topsun-S1000 full spectrum LED. Is this overkill on the lighting??

  4. I run 3 electric Sky 300 V2 wide band LED lights which have an amazing wide band spectrum and I've added two california lightworks Solarsystem UVB lights at 25 watts each in my tent and my setup will produce way better quallity and resin then any CMH on the market now with half the heat. You totally forgot to mention that CMH throw way more heat and of your running anything more than one 630 watt light, you will need to factor in the cost of your air conditioner you will need to run. And with that, your better off spending some good money on GOOD LED and a UVB light which mine were only 99 dollars each. My setup may cost double to buy but in electrical savings and savings on bulbs and not needing an air con, it works out to be a much better choice for anyone with a grow bigger than 4×4.

  5. Kind of skimmed through the comments but personally I use (2) phytomax 2 1000w leds Over a 4’x8’ flood and drain table holding 128 plants sea of green style BUT I ALSO USE SUPPLEMENTAL LIGHTING AS WELL those being extra UV fixtures designed for reptile use… I racked my brain for years on how I can combine yield and quality and this is what I’ve come up with … I pull about 6lbs of top shelf dispensary quality buds from this setup … I want to thank you for pointing out it’s not always quantity but QUALITY that patients are looking for 🙏🏻🙏🏻 have a blessed day

  6. Do you know if any companies that make air cooled fixtures that work with CMH? All of these open reflectors seem like terrible heat management problems for warmer climates.

  7. Had good luck with 1000 veg/600 bloom hps light. First grow but working hard, getting ready for light in second tent with expensive seeds. Don’t care about electricity bill, just want best. What about these oled I’m hearing about?

  8. Metal halide produce uvb. As well . Glass blocks uv. So hid. Reflectors with glass removed , but watch the heat and because of this 315 cmh is a better choice with remote ballast. Lab test in side by side .. cmh x 3 vs 1000 de. Light rail. Same potency . Same weight

  9. Point taken about the UV-radiation, however: considering the questionable legal status of growing Cannabis in many places of the world, it should be said that both heat imaging and sudden spikes in energy consumption are methods the popo employ to sniff out grows.

  10. I've been using the 630w Nanolux CMH lights for about 18 months now and they work perfectly for the later phases of vag all the way through flower. Was thinking about switching to LEDs for the power consumption but now I'm not so sure.

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