In article ,
mentioned...
I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts, so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Well, the life of a bulb is roughly (rated voltage/operating voltage)^6
so (12/5)^6= 191 * 15 hours = 2865 hours. I'd call these 5V bulbs...

I was going to post something on this, but refrained. However...

[snip]

He didn't say where he got the 12th-power rule. Anybody know?

Well, the GE mini lamp catalog mentions this, and GE has been around
since day 1, so I would guess that they came up with the figure.


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