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Gordo B
The power plant (batteries) are sending 10.8 volts to the bulb, the bare bulb meassure at the manufacturer produces 1234 lumens, the 951 figure is after factoring the customary 23% loss of light thru reflector and reflection from the lens.
The 8% losses thru reflection from the lens, could have been reduced by 6% with the use of a clear anti-reflection coating (same as they reduce light loss in binoculars and scopes) but the heat of this lamp is so intense that eventually will cook a halo in the coating.
So the lens is a regular Pyrex without anti-reflection coating.
black bear 84
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