Fluorescent T9 Circline Light Fixtures

[NinjaPoodle]

"go with LEDs", you mean like these LEDs?

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It doesn't matter, you drilled holes in your antique lamps destroying them. If you would have gone with LEDs you would have to do that since they run much cooler.

I think you missed the point that most of the "bulbs" in that photo are burned out

It doesn't matter, they are still better than CFLs.

[Smucky]

Out of ideas for content. Maybe I can record turning it off and on rapidly

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[Smucky]

I forgot there is the fluorescent tube in the HVAC unit I can record. The ballast is "programmed start" which means it should have three distinct stages of starting the lamp, pre-heating, ignition, and run. And indeed, when power is first applied, there is a good second before the lamp lights. So I would expect to see the filaments start to glow. But I don't hmmpf

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[Smucky]

Felt like since I swapped the ballast, that the new one is dimmer. Even though, best I can tell it should be brighter. Ever weirder it seemed like the lights in the other rooms were brighter when I swear this fluorescent one was brighter. I was running a $5 generic lamp and was getting tired of the crappy CRI anyway so figured I'd swap it out for one of the $20 philips ones. And whoa, yea way brighter and way better CRI. Check out the spectrum, wasn't expecting to see yellow

And now my yellow fluke meter is yellow, unlike last time

Strangely the old bulb was growing a black dot on the inside, maybe from turning it off and on a bunch that one time

Before the swap, I did try to at least get some numbers to determine the "brightness". Best I could come up with was to use a small 1 volt solar panel. It reads 1.25 volts in full sun.

The highest I could get it to read with the old lamp was 1.040 volts, at the center of the lamp shade read .950. And the highest I could get using a nearby wall to reflect the light was .381 volts. The new lamp has 1.060, 1.018, and .402 for the same locations.

I'll try to compare numbers after a month or so, hopefully the brightness doesn't fade.