I totally agree w/ X, WELL I USE 5000k and ordered a 6500k, u might have to order it. im of the opinion that a dual spectrum is good, depending on the stage of development i.e veg or flowering the ratio is what i look at. i ordered a nice plug &play HPS grow panel yesterday....should be here mon./tues. IOW- what i mean is in veg. state i would have say for example 1 2700k for every 3 or 5- 5000/6500k. and during flowering i'd have say 4 example, well w/ the HPS i'll still use my cfl's for more lumens/lux. i would use 4 or 5 cfl's that are 5000k or 6500k (which seem hard to get b/c not many ppl. use bright-ass light like that in their living room..LOL). w/ my hps and 6 other 2700k cfl's.
right now i have over 20,000 lumens w/ the cfl, plus the HPS I'll be getting is 16,000 lumens alone, plus i have another cfl on order 6500k. i rather use cfl's for veg. then MH. but for flowering HPS is the best. see, u can use a metal halide for vegging but not thru the whole grow cycle BUT w/ an HPS u can use for flowering and throughout the whole cycle (i don't recommend unless ur auto-flowering) but my belief is the HPS red/orange spectrum is more important. just my opinion...u know what they say about opinions. LOL
p.s. i forgot X, THE Y-SPLITTERS I USE TOO. VERY GOOD WAY TO CONCENTRATE AND SAVE SPACE. ESPECIALLY W/ HOOD AND MYLAR REFLECTORS. I USE 42WATT CFL ( I DO HAVE A 25WATT) SO it can be a tough squeeze- i broke 1 last week....had to buy another...just glad it wasn't 1 i ordered.
BEST WISHES....................joey