http://www.mega-lite.com/download/necannonwa/photometrics.pdf
were unresponsive, so can anyone help me with formulas or rules of thumb connecting beam angle, beam lumens, center intensity and beam efficiency?
I've done the steradian thing and it doesn't work but I am waiting on two textbooks that hopefully cover these kinds of measurements, preferably for spotlights.
Then perhaps I can make sense of
http://www.iar.unicamp.br/lab/luz/ld/L%E2mpadas/Lamp%20Data%20%20General.pdf
without going to the trouble of reverse-engineering the connections between these columns.
TIA.
were unresponsive, so can anyone help me with formulas or rules of thumb connecting beam angle, beam lumens, center intensity and beam efficiency?
I've done the steradian thing and it doesn't work but I am waiting on two textbooks that hopefully cover these kinds of measurements, preferably for spotlights.
Then perhaps I can make sense of
http://www.iar.unicamp.br/lab/luz/ld/L%E2mpadas/Lamp%20Data%20%20General.pdf
without going to the trouble of reverse-engineering the connections between these columns.
TIA.
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