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Eol test between fixtures with bad ballast

Eol test between fixtures with bad ballast

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Left has the bad ballast. Right has the good one. Same lamps were used and the EOL was placed on the blue wire side only, both times.
On the left, the lamps power up to almost half brightness and flicker at 30 or 60hz. When the same pair is on the right, they barely light up at all.

Ballasts are both HPF Universal thermomatics from the 80s with green label

20200108_133644_HDR~2.jpg 20191126_134018.jpg 20191126_124810_HDR~2.jpg 20191122_155429_HDR.jpg

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Filename:20191126_134018.jpg
Album name:Lightingguy1994 / Lamp comparisons, ballast fun & Experiments
Keywords:Lamps
File Size:1433 KB
Date added:Nov 26, 2019
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Patrick
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Nov 26, 2019 at 03:39 PM Author: Patrick
So does it rectify as though that bad ballast is low power factor? I believe that can happen if the cap is shot.

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Nov 26, 2019 at 03:50 PM Author: Lightingguy1994
Yes, its as if the ballast was made as LPF. Each fixture was fitted with good lamps and tested separately on the kill a watt

Bad ballast, good lamps
76W
0.96A
0.67Pf

Good ballast, good lamps
97W
0.81A
0.99Pf

In the next pic over you can see the AC phase from both strips do not match on camera.
I plan to still use both anyway as long as the bad cap doesnt cause any dangers
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Nov 26, 2019 at 06:25 PM Author: Bottled lightning
The cap is shorted, I’ve seen several advance ballasts like that and they usually cycle on the thermal switch after about an hour. You could try replacing one lamp with a 2-3uf capacitor.
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Nov 26, 2019 at 06:29 PM Author: Lightingguy1994
Interesting, ill have to give it a long test and see if that happens. So far i did not notice any unusual temperatures
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