Quote:
Originally Posted by stevej37
^^^ And they are about half the diameter. 
Glad that I didn't have to put new ballasts in. There has to 16 or 20 wires that have to be cut and spliced in for the change. My neck is sore just thinking of it.
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Most of them never go back in it you use ballast bypass lamps. The most you need within the fixture is 2 from the source to one tombstone or both if you want to do it that way. The original hard wires were for high voltage and can be tossed. I find it easy to leave a stub out from the tombstone and just wire nut it.
Note, the original wiring in the housing are too short to make a run from one end to the other, so using some new wire off a spool makes it go fast and is a clean installation.
Do one and the rest you can do on autopilot.
The reason LED replacement still work
with the ballast is that a ballast settees down to line voltage after start up requirement voltage for the old fluorescent lamps, but the new lamps have to be designed to handle the surge. With LED the ballast is extra baggage.
I get rid of them as they can still go completely bad, not just weaken. They buzz too.