>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.


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