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Shop light acting funny.

Shop light acting funny.

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I got a bunch of these shop lights with universals from craigslist with tons of 80s GE bulbs. Most of the TIME it works fine but once and a while it runs dim one and lamp on left turns blue on the end which is the lead side. I think it's the lamp starting to go. I changed it to a westy no problems yet.

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Filename:20170728_212720.jpg
Album name:veryhighonoutput / F40
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Date added:Jul 30, 2017
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Date Time:2017:07:28 21:27:20
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Patrick
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Jul 30, 2017 at 01:08 PM Author: Patrick
Use a multimeter and make sure you're getting 3.8V across the the socket contacts on that side. If not, check the voltage across the leads themselves. If nothing, the fault lies with the ballast. The fact that the Westy works doesn't mean much. Lamps will almost always fire up for a while without heating one end. Repeat cold starts begin to suppress the cathode's ability for thermionic emission, and the problem recurs. This is why back when rapid start was the norm, this issue could often go uncorrected, given that it was not immediately evident after a lamp change. Although any sputtering cannot be reversed, if it hasn't been too long electrode will largely be restored once heating is reintroduced.

If the socket tests out good, check continuity of lamps pins. With old lamps the problem is sometimes corrosion, a light sanding the pins may be all that's needed. If there's still no continuity, it may be a broken cathode or lead wire. The lamp might still be usable on an electronic ballast. If everything seems fine but that lamp still won't start, run it on an electronic ballast for a while. Then put it back on the magnetic ballast and see if it will light.

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Down with lamp bans!


GoL the.baus.of.all.bauses UCDl2EWWZc9h1IZXcfGU9OZA nicksfans
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Jul 30, 2017 at 01:25 PM Author: nicksfans
Yeah, that end that's turning blue isn't getting cathode heating.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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T12


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Jul 30, 2017 at 07:41 PM Author: veryhighonoutput
Exactly I see corrosion on the GE pins I think that's the case the westy has clean pins having no problem so far. The sockets suck too there way to small for t12 they barely fit I already broke 1 tring to cram the lamps in there.

T12/ t17 there's a reason they made heavy magnetic ballasts

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Jul 30, 2017 at 08:37 PM Author: Lightingguy1994
You need to get the longer tombstone sockets
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Aug 02, 2017 at 08:41 PM Author: veryhighonoutput
Yes I need to order a bunch

T12/ t17 there's a reason they made heavy magnetic ballasts

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