I am trying to calculate DGPs for a whole year in hourly values. To calculate vertical illuminate on the eye level (Ev), I considered a small grid in eye level facing to the window and extracted the hourly values of vertical illuminance. 

However, when I manually calculate DGPs based on the following equation, I observed DGPs exceeding one. 

DGPs = 6.22 × 10−5 * Ev+ 0.184

I have two question:

First, if my assumption of considering a vertical grid is correct?

Second, do I need to define a threshold for high values of illuminance when calculating DGPs based on this formula?

I would be thankful if anyone can guide me in this matter. 


Tags: DGP, Glare, Illuminance

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