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
Subject:
Re: [RFI] 120v halogen lights
From:
"Tom Rauch" <w8ji@contesting.com>
Date:
Sun, 4 Apr 2004 10:23:22 -0400
To:
<rfi@contesting.com>, "Pete Smith" <n4zr@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.
73 Tom
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|