I used to use 2 of these types but I was always messing with the arm tension


For now I just use 2 twin tube 40w flouresent over the work area.
With them spaced about 4 feet apart shadows are not much of an issue.

How about this light


http://www.pontiacs.org/pics/project...0hps_video.avi

Just kidding! Thats my SW aquarium light.. about 430w and HOT!