Any typical tungsten bulb suffers the same problem over it's life,
it's output goes down. The neat advantage of halogen bulbs are that
they do not diminish brightness as they get older. Therefore all US
cars now have (which our European friends had for a long time) Halogen bulbs.
Remember when Square Headlights came into American cars? It was a
rule change from the Feds that allowed it, even though Europeans had
them for years before we did.
Stewart
At 07:21 PM 4/11/2007, you wrote:
>EL= RL * ( RV / AV )^13.1
>Now plug in 100 volts for AV. The life of the bulb soars to 8172 hours.
I ran into this formula many years ago and was initially excited by the
result. But it was one of a pair of formulas, the second formula gave the
lumens of light produced vs voltage. When I tried that equation I
discovered that the light output declined rapidly too. A long-lasting
light bulb that produced almost no light was not too exciting.
Rev. Stewart A. Marshall
mailto:[EMAIL PROTECTED]
Prince of Peace
Ozark, AL SL 82
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