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I'm involved with a query about Transmittance in this other thread and I need a way to convert lumens to actual power. there are many pages relating lumens out of a light bulb to the electrical power input but all I can find about the lumen is self-referential and uses terms like 'perceived' light. It's not trivial if you want to include a particular illuminant because the spectrum and the spectral response of the eye. Does anyone have a link that unravels the whole business?
Cheers
Cheers