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#1
January 31st 08, 09:15 PM
posted to rec.aviation.homebuilt
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Landing Light bulbs
Jerry Wass wrote:
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 The reflecting area is larger. 15.55 in^2 compared to 25.51 in^2 
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#2
February 1st 08, 01:00 AM
posted to rec.aviation.homebuilt
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Landing Light bulbs
Gig 601XL Builder wrote:
Jerry Wass wrote: 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 The reflecting area is larger. 15.55 in^2 compared to 25.51 in^2 #4559-PAR-64 8.1"Ø= 600,000cp-(with 600 watts input) would this equate to 100,000cp- (with 100 watts input)?-- Yet it's area is 51.5 1n²--or nearly 3.31 times as big as the 4509.
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