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I’m looking for a method to define the illuminance
(lux) in a zone. The purpose is to know when people put on the lights in a
space. I thought to use an output of type 89b: TMY2 Data
Reader. But I don’t find some explination about some outputs.
So I don’t know for sure what the difference is between the output
‘direct normal illuminance’ and ‘global horizontal
illuminance’. Or does anyone suggest to use another output or
method ? Further when I plot these outputs the results seem to be
extremely low : the maximum value over one year is 935illuminance for the
direct normal illuminance and 970illuminance for the global horizontal
illuminance. To end a question to be sure : the unity illuminance is
equal to lux ? Thanks in advance, |