I like the clamps on lights for regular bulbs I get from Home Depot. They have two kinds. Get the one with the 15' cord and the heavy duty clamp. This way, I can mount them high up out of the way. I use either a spiral florescent bulb or a halogen.
Being an electrician, I run extinction cords and three way adapters and then more ext. cords.
Also I've adapted one of those 20,000 lumen mercury vapor lamps, whoops, luminaires.
~Peter