rush..a suggestion.
Rather than divide your closet horizontally(2 sections, 6'Lx2'Wx4'T).Divide it vertically(2 sections 3'Lx2'Wx8'T) Reasoning..it's going to be pretty difficult to "efficiently" kight an area 6 ft long and only 2 wide. Unless you plan to use two lights. One near either end of the room.
Regardles of your reflector hood, mylar, ect. As light distance from the source increases, intensity decreases.(Inverse square Law) I don't feel that a "low wattage" light as you're speaking of, will provide the intensity needed by the time it reaches to both ends of the room.
IMO, in a space of those proportions, 2-250's would be the minimum that I would recommend.(still les than the
optimal, 50 watts p./sq/ft.)
using the sea of green, the book says you can use as low as 75 watt hps.
seems like if i get full red spectrum. that's all i need. is there something else the hps can offer that i'm not considering?
If your book states that a 75 watt hps will provide enuff efficient light to grow in 12 sq ft area...."IMHO" get another book. That works out to about 6 watts per sq ft.
"Red" spectrum isn't all that is needed. Plants require a "full" spectrum for the best results. HPS provides the widest spectrum available, I believe. Especially if you go with some of the "enhanced spectrum" models.
If you want bulb that's under 250 watts go to any electronics supplier with a computer. If they don't have a computer, you're going to ahve to buy bulk.
??
Lowes/Home depot carry a variety of hps fixtures and bulbs...
ALL under 250 watts. In fact I believe a 150 is the largest they carry in my area. The problem with these, the ballast is part of the fixture, which adds a lotta' heat to our area. BUT, those ballists
can be rewired to a "remote" location.