Pam,
It is working a treat! I still have a bunch to learn, such as not sow so many seeds in a given amount of space. But part of the problem, at least in every experiment I have tried over the months, is that tomato seedlings get leggy - it doesn't matter how many lumens they get, from what kind of light source they get them from, what the temp is. I probably need to try a MH light at some point, but unless I win a lottery, it will have to wait until after I sell a few dozen plants. But it should make for a good experiment this summer:
Ladies and gentlemen: Welcome to the grow-off. On the left-hand side is a 150 watt bulb, weighing in at 4100K and 12,000 lumens - please welcome Metal Halide!
Now ladies and gentlemen, look in the middle of the box. Tilting the scales at a measly 105 watts and 5000K and offering only 6,900 lumens, greet our underdog, CFL!
Lastly, on the right hand side is the disputed champ. He packs 15,000 lumens into his 150 watts and has a 5000K rating, High Pressure Sodium.
This battle will last one round, 45 days. The winner will be determined by a combination of height, lack of internodal length and number of leaves.
May the best light win.
Mike