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This issue has been confusing to me for a while, according to the calcs below on Meyerfire Prep 2019, it looks that Lumens = cd, I doubt this is correct.
If I search the internet, there are should have a factor, which is the solid angle. Cd = lumens/ sr From Wikipedia I found that E is Illuminance which is in lumens/m^2 which is the incident flux on a surface, as in the problem. One lumen per square meter is a Lux. Are the units on this correct?
2 Comments
BM: Looking for clarification on problem 151. Why do you use the full length of the room (12.8m) when the strobe is centered on that wall (6.4m)? Wouldn’t this make the farther distance for the sound to travel be the 9.2m? Yielding answer b, 34cd?
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