Quote:
Originally Posted by lane912
It depends on the wavelength. If we use the wavelength where the human eye has maximum sensitivity, 555 nm (yellow green), then 1 W = 683 lm. That's 1.464 x 10^9 picowatts per lumen.
At 69 picowatts per LED you would need around 21 million of them to give you a lumen!
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So 21 million of them to make as much light as a candle. How much does it cost to make 21 million of them and how big is the lamp going to be?
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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