RBM wrote:
The 4 foot T12 fixture is and always has been a miserable design.
There are higher quality ballasts you could buy, or just keep
switching standard ballasts until you get lucky. IMHO the best
solution is to get an electronic ballast for (2-32 watt T8 lamps) the
ballast and the T8 lamps will work in the same fixture and will work
better and will not buzz "PrecisionMachinisT"

Excellent advice.

See also:
http://www.ecmweb.com/construction/e...allast_update/