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Blown Fluorescent Light

Blown Fluorescent Light

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Blown Fluorescent Light

IMG_1121.JPG IMG_1119.JPG IMG_1083.JPG IMG_0859.JPG

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Filename:IMG_1083.JPG
Album name:mdcastle / Misc
Keywords:Lamps
File Size:391 KB
Date added:Jul 17, 2019
Dimensions:2464 x 1848 pixels
Displayed:129 times
Date Time:2019:07:17 12:45:25
DateTime Original:2019:07:17 12:45:25
Exposure Bias:0 EV
Exposure Time:1/845 sec
FNumber:f 2.2
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Focal length:4.15 mm
ISO:25
Make:Apple
Model:iPhone SE
Software:12.2
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freekster0722
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Jul 17, 2019 at 08:06 PM Author: freekster0722
It was suffered from loss of vacuum!
mdcastle
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mdcastle 26956281@N02
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Jul 17, 2019 at 08:54 PM Author: mdcastle
This was on an instant start ballast. I went downstairs and noticed both tubes were out, so I figured it was a bad ballast. I shut the lights out for a while without investigating further or unplugging it. They next time I went downstairs I switched on the lights, and heard a pop and a flash and this happened to one of the tubes, but the other tube lit normally.
vintagefluorescent
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Jul 18, 2019 at 06:12 AM Author: vintagefluorescent
Was this tube a GE Mainlighter like the one on the left?
mdcastle
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mdcastle 26956281@N02
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Jul 18, 2019 at 09:35 AM Author: mdcastle
Yes it was, of the three cases of early 1970s mainlighters that my father saved, I have 14 left in service, one spare, and one I'm going to keep for my collection. They seem not to work well with the three instant start fixtures I have, they're underdriven and don't last long.
Lightingguy1994
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Aug 25, 2019 at 02:37 PM Author: Lightingguy1994
You should not be using these on instant start. You need F32T8 lamps or a magnetic F40 ballast for the mainlighters
bryanrb
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Aug 25, 2019 at 06:21 PM Author: bryanrb
Why cant the mainlighters be used on IS? Are you referring to the electronic ballasts as IS?
mdcastle
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mdcastle 26956281@N02
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Aug 25, 2019 at 07:17 PM Author: mdcastle
The fixture specifically said "For all 25, 32, and 40 watt 4 foot fluorescent lamps." I took that at face value.
bryanrb
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Aug 25, 2019 at 07:51 PM Author: bryanrb
It was then more likely that it was a defective lamp. The seal on the cathode likely failed since the lamp was old. I doubt the ballast had anything to do with it.
Lightingguy1994
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Aug 25, 2019 at 07:51 PM Author: Lightingguy1994

Yes it was, of the three cases of early 1970s mainlighters that my father saved, I have 14 left in service, one spare, and one I'm going to keep for my collection. They seem not to work well with the three instant start fixtures I have, they're underdriven and don't last long.


It was mentioned in the above comment that they were being used on instant start. Not a good idea as noted, life will be short and thats not a good way to treat mainlighters considering how rare they are getting by the day. Instant start is usually those F32T8 ballasts with one wire to each socket
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