When your fluorescent light flickers or makes a loud and annoying hum, a degrading ballast could be the cause. Replacing a ballast is easier than you think, but ballasts can be expensive ...

This document is intended for contractors working on a job site within CU Boulder Campus. In short, Ballasts removed from fluorescent lights by Contractors during University of Colorado at Boulder ...

For all the fluorescent bulb-bearing light therapy units out there ... directional and the other omni-directional. They both use ballast-controlled ceramic metal halide bulbs.