Something I am finding interesting. I'm running out of lights for the seedlings I have coming up. Not enough lights to keep in the germinator. But I had a nice 20 watt, CFL, 2300K bulb which gives out enough light to take care of four cups. That light is nearly magical. Plants that have been up two days are nearly as large as plants that have been up two weeks but under normal flourescents. Their PAR value is extremely high, but then again, they do not cover much area. On an operating cost basis alone, I would use 120 watts per hour vs. 80 for regular, 40 watt fluoros to basically cover the same area. Not a big difference, though - $2 per month if I run them 16 hours a day.
Mike
Mike