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#1
January 31st 08, 08:50 PM
posted to rec.aviation.homebuilt
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Landing Light bulbs
Why does the diameter of the reflector have so much effect on the
output-(candlepower)--of bulbs having the same power input?? i.e. #4509-PAR-36 4.45"Ø 110,000cp #4537-PAR-46 5.70"Ø 200,000cp And then we have the newer import cars using 2.5" reflectors (+ a condensing lens of similar dia.) which are apparently equal to the larger rectangular bulbs of conventional design. then there are the hand lanterns with QH peanut bulbs of 50 to 100 watts boasting 500,000 to 1,000,000 cp. Jerry 
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