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PostPosted: Mon Feb 27, 2023 11:43 pm 
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As I said, there are some LED's that run on AC that work just fine.... I have had no problem with my liquid filled (cooled) ones.... I can't vouch for any others.... other than DC powered ones....

Bob

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PostPosted: Tue Feb 28, 2023 9:08 am 
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rsterne wrote:
As I said, there are some LED's that run on AC that work just fine.... I have had no problem with my liquid filled (cooled) ones.... I can't vouch for any others.... other than DC powered ones....

Bob

Where might one find those LED's Bob?

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PostPosted: Tue Feb 28, 2023 9:36 am 
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I bought some led lights from Princess auto that were meant as car driving lights. They were 12v.
I couldn't get it to work. Numbers on the chrony would just keep flashing and changing.
I hooked it up to a variable power supply and found it worked at exactly 10v no more no less.


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PostPosted: Thu Mar 02, 2023 6:28 am 
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We measure RPM on model airplanes and if you point the sensor at incandescant AC bulbs you get 3600rpm 60 flickers a second. Just for info.


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PostPosted: Thu Mar 02, 2023 6:30 am 
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Sorry dup!


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PostPosted: Thu Mar 02, 2023 11:56 am 
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I bought mine at Home Hardware, but I haven't looked lately to see if they still carry them.... They were listed as a "compact LED" bulb, and liquid filled/cooled so they could be smaller....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal; Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Thu Mar 02, 2023 11:48 pm 
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There seems to be some confusion in this thread over incandescent and fluorescent lamps.

An incandescent lamp has tungsten filaments that burn and glow when energized. There is no pulse to them as the energy release is steady, and un-interrupted.

Fluorescent lamps pulse with the alternating current they receive. I have yet to see an electronic ballast for these that cycles faster than 60hz, regardless of voltage.

LED lamps with visible bulbs on them on alternating house-hold current pulse as well.
Battery operated LED lamps are fine.

I've done best personally with incandescent night light lamps from the dollar store OVER the diffusers on my chrony.
The only thing better is direct sunlight.

Incidentally, digital cameras record pulsing light sources as moire, which is easily visible in the final image.

-D.S.

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PostPosted: Fri Mar 03, 2023 6:22 am 
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Copied............
There are two voltage peaks in each cycle, one positive and the other negative. Incandescent light bulbs don't care about polarity, and so will reach a peak of brightness on each of the voltage peaks. This repeats 60 times a second, therefore there will be 120 brightness peaks per second.

You can confirm this by taking a light sensor (photodiode or phototransistor) and hooking it up to your oscilloscope, and shining an incandescent light on it.


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PostPosted: Fri Mar 03, 2023 1:56 pm 
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Location: South River, Ontario
rsterne wrote:
I bought mine at Home Hardware, but I haven't looked lately to see if they still carry them.... They were listed as a "compact LED" bulb, and liquid filled/cooled so they could be smaller....

Bob

Thanks Bob, I will check out Home Hardware.

_________________
1976 Sheridan Blue Streak .20
1977 Webley Hurricane .177
Slavia 630 .177
Gamo Magnum .22
Beeman QB Chief .22
Beeman AR2079A HPA .177
Beeman P17
Umerex Colt Commander
Artemis M11 MK2 .22
FX Dreamline Classic .25
Hill EC-3000 compressor


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PostPosted: Sat Apr 22, 2023 9:15 pm 
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Hey there! Sorry to hear about your experience with the T10 LED bulbs for your Shooting Chrony. It seems like the AC flickering issue you mentioned might be the culprit. I've heard similar stories of LED lights not playing nicely with certain devices due to the flickering. Glad to hear the incandescent lamp worked as it should.


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