Quote:
Originally Posted by mx4inpa
Plants reflect green light. It's also what lumens are measured in, because thats what our eyes see best. Pretty much all bulbs have that component.
If you want what I consider to be the best bulb then youd go ceramic metal halide. They have a CRI over 90 and the most sun-like spectrum of any bulb on the market. Lots of money for a 1k though (around $200). You can get 400w retrofit CMH that will run in a HPS ballast for around $50.
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This is what I am using in my growroom. the CMH is the best way to go.