Rule of Thumb

ESTIMATING THE LIFE OF A LIGHT BULB

If you increase the voltage of an incandescent light bulb by 10 percent, its light output increases by 40 percent, ...

If you increase the voltage of an incandescent light bulb by 10 percent, its light output increases by 40 percent, but its life expectancy falls by a factor of three. Decreasing the voltage has the opposite effect. — R.A. Heindl, design engineer, Euclid, Ohio

02/14/15

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