Re: Fluorescent lights and humidity
The T# is the diameter of the tube, in eighths of an inch. So T12 is 12/8" (1-1/2"), T8 is 8/8" (1"), and T5 is 5/8".
One big advantage of the T8 with electronic ballast is that they usually operate at a higher frequency, so the flicker isn't as noticeable. They are also more efficient, producing more lumens per watt.
Most fluorescent fixtures require that the reflector -- the metal part behind the lamps -- be grounded. I think this has more to do with preventing radio interference than functional operation of the lamp.
Last edited by Fencepost; 06-13-2012 at 12:52 PM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.