EDIT - sorry I had seen BTTs pics, and yeah they are seriously impressive. A big thumbs up for using cfl's.

you just made this whole thing a hell of a lot harder. I had my finger on the trigger ready to order the 129 HPS system from htgsupply cause its dirty cheap but im scared shit of heat and seeing those nuglets you got with cfls are making me wonder and drool. Is heat buildup outrageous with the 400 watt hps? or even 400mh? Like if got too hot, is fire likely, do they just shut off, am i asking for fire putting it in closet. I was going to maybe put a blower on bottom. like the floor drying type so it could vent out of 2inch crack / space underneath door on bottom. Would i have to do the same with 2-4 cfls, put the blower cause they also get hot?

43 watt CFLs = 150 watt equivelant.... this is a great light....

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I use the 42 watt CFLs, but they are only about $8 at my Lowes/WalMart/Target and cheaper if you buy bulk. I was able to get a box of 12 at Lowes with a 10% off coupon for around $70, and bought cheap reflectors/plugs for about $15 more. For about $85 spent over a couple weeks, I now have a great setup. I would agree with you that if it's 40 Euros for 1 bulb, just get an HPS.

I love them because I was able to get a complete setup that puts out over 22,000 lumens, requires only a small fan to displace the heat and I keep them about 3" from my plants. I don't have that much height to spare in my grow area, so this is crucial. Also, the total wattage on my 8 is 336, so it's lower than the 400w HPS. I also like them over HPS because with 8 bulbs, I am able to reposition them when I get rid of males and give side lighting to females. My grow is in week 2 of flowering and I had to kill 2/4 because they were males, and I'm excited to see what my 2 ladies will yield. I will also be cloning and starting another CFL grow this summer.

hey whats up? i like what oyur doing with the cfls man. im trying to get set up with some to & make a box but im not quite sure of the exacts any pointers would be great