Ok I am looking into this. I am building closet set up, HID seems like a bad idea. So LED is the better selection. My area is only 2' X 3'. It seems like you are building them for a wider area then I will be dealing with. What size would you recommend? I would also like to have a wider light not a brick light, but i am not sure it would make a difference in this small a set up. There seem to be some serious obvious advantage to LEDs, at least for a cabinet/closet grower. Now I haven't bought anything, I want to design the system then buy the parts(get a solid concept of what I want).

You keep talking about putting things an 1 1/2", but if you do that a lot of the light energy for the bottom leafs would/could not be used. It is the same concept of you can have /light\ (wide) or you can have [light] very focused(which is what you are doing). Light reflect off the leaves and putting it a small distance(4'-6'?) away would be more effective it would seem. I guess what I am saying is that you can't over focus you light to much otherwise it would over shadow everything else? I don't think anyone has brought that up.

Maybe it would be better if you had more of a canopy top? That is why a goalie in soccer charges the player shooting because it makes the goal smaller. You are doing the same thing, by focusing to much light close you really aren't covering a wider area. Unless you have both blue and red light in each small section, which would take butt load of lights. (Maybe I am picturing things wrong?)

Also have you to taken into consideration too much of anything is bad(64 X the light, righteous)? A plant can only work so hard effectively? If they could work that hard would you need to keep close track of the water/nutrient level, it would drink a lot faster? Would this change nutrients up any? It seems doing a lot of these things would in effect only speed up growth not necessarily so much on yield(though there would be a small increase)?

You do have far more knowledge of LEDs, so I will listen to what you say these are just things I have questions about. Sorry for the twenty questions. I have been reading and understand some things, I need to know a bunch more before I get buying let alone building.