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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