now I started reading got to about page 15 and had to make a few points and an observation.
dont mean to flame the thread but....FIRE ON...
Last frontier's first post "i will say in defence of the production grower large intense lights are a good and usefull thing because it cuts down on the doliers per OZ of production that in my opinion is the onley time you would need the extra lumens "
look how he spells dollars and only, proof he is 12 and getting Fs
plus he states how HIDs do in fact get more ozs per what, and at the same time he gets more gs per watt then the best known recorded production grower.
Maybe he cant spell or use spell checker cause English is not his first language. But he contradicts himself in the first paragraph, as far as a true grower, when contrasted to his persona on this thread as far as I read.
Now I think he is novice, maybe child, but for my karmas sake, I will say slow or non English speaking.
So I will give advice because I think that is what he is asking for. The answer is: If you want to adjust spectrum it would be best to go with a single or an aray of 400-600 watt hps, and then you could add supplement light spectrum via clf or led. With led you can get the 12 watt floods spectrum specific blue or red. Lumen's are not what the plant uses to grow as much as spectrum. Now the spectrum of hps is better than any kelvin ratting of cfl for budding production, but as a supplemental lighting (preferably hanging vertically in the corners at center plant level) they could increase yield.
Remember at the cost of good medicine, the little yield increaser can add up to big savings.