Is there a way to test mercury vapor bulbs (with the large mogul
base)? I need to isolate a problem with a large outside yard light and
isolate the issue between the bulb and the photosensor.
Thanks for any tips.
No real way you can test the bulb alone, other than to swap with a known
good one, or in another working fixture
But if the photo sensor is the plug and twist type, you can check voltage
there easily enough.
Why aren't you asking about the ballast ?
Because I'm just learning about these lights. I assumed that the bulbs
were the most likely to fail and they are easily replaceable. What do
I need to learn about the ballast? Is it replaceable or does one just
replace the fixture to fix a ballast?
You can pretty much think of them the same as a fluorescent strip, if that
Testing of the parts is pretty similar for all gas discharge type lighting.
Easiest way to test a bulb is in another working fixture.
Or try a known good spare.
You can not simply go by a $2.00 ohmmeter continuity test, as you can with
a regular incandescent bulb.
But depending on the light sometimes the ballast is worth more than a
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