11 Nov '17, 11am

Part 2 in a series about about measuring and calculating #Lux values!

Part 2 in a series about about measuring and calculating #Lux values!

If you read through this process a few times, I think you will find that it is quite intuitive. One way to think about the fundamental concept is the following: if the clear detector were illuminated by a pure red light and then a pure green light of the same intensity, the output would not change (assuming that the clear detector is equally sensitive to all wavelengths). This means that at least one of the corresponding lux values cannot be anywhere near correct, because the irradiance-to-illuminance factor for red is much lower than for green—in this case, 205 vs. 615. So what we are doing here is finding the “average” conversion factor based on how much R, G, and B radiation is in the ambient light . If the light were pure red, IRR would be 100%, and IPG and IPB would be 0%. Thus, the overall conversion factor would be the same as the conversion factor for red, i.e., 20...

Full article: https://www.allaboutcircuits.com/technical-articles/measu...

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