[RFI] 120v halogen lights
martin at aa6e.net
Sun Apr 4 13:58:38 EDT 2004
OK, I've heard this said before. But inquiring minds want to know: why
should DC be worse than AC for lifetime in lighting applications?
I seem to recall it was an issue for vacuum tube filaments, presumably
because having a DC gradient on the filament led to unequal
concentration of emission on the filament. (On the other hand, AC
supplies could lead to hum.) But in a lighting situation?
I can think of a couple reasons why DC might be better: no AC-induced
vibration, unity peak to average power, etc.
73 - Martin, AA6E
> Re: [RFI] 120v halogen lights
> "Tom Rauch" <w8ji at contesting.com>
> Sun, 4 Apr 2004 10:23:22 -0400
> <rfi at contesting.com>, "Pete Smith" <n4zr at contesting.com>
>>I assume that there is no reason why any real transformer that delivers
>>12.6vac couldn't be used -- perhaps even an AC wall wart.
>That's right, as long as it is AC. If you run DC bulb life is shorter.
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