Well, not too exciting; but just a little exciting.
Many years ago there was an inexpensive night-light sold that put 2
bulbs, 7 W each, in series. It still gave enough light for a
night-light, and it didn't have or need a switch. The cost of
electricity was low, and the life of the bulbs exceedingly long, so
they were on at all times and I never "forgot to turn on the
night-light." Of course today we have solid state light detectors,
circuits, and light sources; so the same function is achieved and the
night-light is on only when it's dark. I don't know how the cost and
lifetimes of the old and new technologies compare.
>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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