Thanks to all of you who contributed to the overdriving lights post. I read the original thread many moons ago, and saved portions to my hard drive. Our HD still has the fixtures, and I put together two sets of overdriven 4ft fixtures last night for a grow table for my Cattleyas.

I will say, however, that I didn't find the fixtures to be as bright as what I thought they would be when overdriven. I have some 96 watt CF fixtures, and find that those appear to be much more intense. Of course, that's also one 36" bulb putting out 9000 lumens versus two 48" bulbs putting out a few more lumens, so I guess that makes sense.

All the best!