Measure nightsky with TSL237

Using Arduino Sensors
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How about uW/cm² to Candela then? Or is there any other way of converting uW/cm² to mag/AS2?

Edit: i found a convertion site for w/cm2 to cd/m2 and according to that, 1w/cm2 = 6 830 000 candela/m2

ref: http://www.calcul.com/light-luminance