My workshop is illuminated by more than 50 fluorescent bulbs each 4 foot long and all powered by instant start electronic ballasts. The ballasts seem to last for about three or four years before they burnout which makes for a tedious repair task. I decided to replace all the fluorescents with LED bulbs which have a rated life of 50,000 hours, consume half the electricity and do not require a balllast at all. The conversion required removal of the ballast from each fixture, installation of new bulb sockets on one end, and rewiring of the lights. The project took the entire day but was well worth the effort. There is nothing more enjoyable than a well lit workspace except one that uses half the electricity.