tdump, I'm not sure about details of your setup but here's mine: Plant trays are on a 4' wide table (used to be a home-made darkroom sink ). Over it, hanging on a rope & pulley arrangement, are 2 double-tube fluorescent fixtures fastened together side by side with wooden cross-battens. So the whole lighting thing is about 4x4 feet. For attending to the plants I can raise the lights high and secure the rope. For adjusting their distance beneath the lowered lights I just prop the trays on bits of wood or whatever is handy; or I can use the rope to tie the lights at various heights. The whole thing is quite hokey and very low-tech. I'll try to do some pictures tomorrow, and post them here.
Right now I have seedlings of leek, onion & parsley under the lights but the past couple of days I've had them out for a few hours in the daylight (not sun), starting to harden them off. Temperature has been around 7-8 degrees (C. !!)