Isn't that what I did say?
Ok, I see what you are saying....
Let me qualify: For those who might like sitting around in the purple sun, just make sure you have some full spectrum white light (natural or otherwise) in there too.
The reason strictly red/blue works for pot farmers is they only expect their crop to survive a few months, not years. The red/blue-only does encourage optimum growth but, eventually the lesser light colors are needed to sustain the life of the plant. But it takes a lot of light. Indoor growers were busted in the past because the phenomenal growth of the plants was only equaled by the phenomenal electric bill. The electric company turned them in.
