Miscellaneous - Finishing off some tubes on a slimline ballast

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Album name:	Vince / Miscellaneous
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Date added:	Apr 14, 2011
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Comment 1 to 5 of 5

Page: 1

streetlight98

[Apr 16, 2011 at 01:44 PM]

In my grandpa's basement, he has a bunch of 4lamp F40T12 troffers. I opened one of them and found the ends of one lamp clear. Now I know why.

A_lights

[Apr 16, 2011 at 05:07 PM]

THats strange, most trotters have rapid start ballasts, the open circuit voltage is in the 400V range, usually vacuum loss occurs with 600 OCV

streetlight98

[Apr 17, 2011 at 06:07 PM]

I didn't check what kind of ballast it was. I know each troffer has two 2lamp magnetic Advance ballasts. The ballasts didn't start the lamps right away, about a 5 second delay, so does that mean it's a preheat ballast?

A_lights

[Apr 17, 2011 at 08:05 PM]

Oh ok, nope that would be rapid start , preheat would be more blinky, and preheat is rare in trofffers, you would see starters if it was preheat

streetlight98

[Apr 18, 2011 at 09:56 PM]

Oh. No starters, so it's not preheat. Well, they don't strat very rapidly, that's for sure. Confused

I went over his house and relamped them. They all work, but man it's a pain changing those lamps crammed into that tight 4X2 housing. I almost broke one of the tubes.

Comment 1 to 5 of 5

Page: 1

Gallery of Lights

Finishing off some tubes on a slimline ballast

This was back in October. I had a few tubes to run up to the vacuum loss. It was more or less successful. one Duro-Test and one Sylvania had a cool vacuum loss, making a clear spot in the phosphors. The others never lost their vacuum...