Here's a situation I hope someone can explain.
I've had a couple of flouresent fixture ballast replacement installations. Both were two 40 Watt T-12 Rapid Start Magnetic ballast types. After the ballast installation I got very a dim glow out of the tubes. Also (in one of these cases) the new ballast hummed.
In trying to remedy these problems I attached the power source ground directly to the metal frame of the fixtures. In both cases that stopped the problem.
Can anyone explain why attaching the ground to the frame of the fixture solved the problem? The only thing I can think of is that it sets up a "field" around the tubes that helps throw the arc through them upon startup.
This is really bugging me, so I hope someone can give me a technical explantion.