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#1
August 28th 03, 08:44 PM
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Thanks for the confirmation of 12th power.
It extends from 60% to 140% of rated voltage. The text accompanying the graph says that, "as approximations", the light output varies as the 3.6 power of the voltage and the life varies inversely as the 12th power of the voltage. It also says of the graphs that "Indicated values (except for long life lamps) are reasonably valid, between 95% and 110% rated volts. Beyond that, indicated characteristics may not be realized because of the increasing influence of factors which cannot be incorporated into the chart." I assume that long life bulbs are excluded because they're already running a a considerably lower than "normal" voltage. At 60% of rated voltage, the graphs show that the current had decreased to about 75% of rated current, while the candlepower has dropped to something like 17% of rated output. (This means the efficiency is around 38% of normal.) Life is around 650 times the rated life. |
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