Hey
They are not only bright they use only 35 watts each! and they come in the correct color....well almost the lowest color i can find is 3000K but this 3000K is very yellow like what you would see in a fog light so i think it will rock. I don't know why no ones ever tried this.
As for the purple cfl, it's been around for a few years primarily in the UK. Haven't seen any one try them but they are suppse to have higher blue and red spectrums but i think they are not bright enough only a third of 6400K so i think light penatration will be a problem. I got them for free from a chinese supplier to try and test them. Just had to pay for shipping and he sent me 6 of them!.
bubbas Reviewed by bubbas on . automotive HID lights vs. cfl's Hi, I'm starting this thread to compare a variety of lights for small closet grows. First i'm posting only light outputs of 250 watt 6400K vs. 250 watt 25000K vs. automotive HID lamps. I built three indenticle boxes 24' X 22" x 36". I'm measuring output at the bottom of the box. in the first photo the box on the bottom left is the 6400K 250 watt cfl, bottom right is the car HID and the top is the 250 watt 25000K. Average light output are as follows. 250/6400K 5000lux peak was 5410 lux, Rating: 5