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I am a faculty in a public school. Our school has to submit an infrastructure report to the funding agency. One of the questions asked is to calculate the 'Daylight Factor' in each classroom.

I have done some research online and I have come up with the following formula: $$DF=\frac{E_i}{E_0}\times 100$$ Where $E_i$ is the illuminance on an indoor working plane and $E_0$ is the illuminance on an outdoor plane (un-obstructed from sunlight).

Is this a good approach? I have seen other formulae which involve the ratio of 'Total window area' to 'Floor area'

Kindly suggest a good approach.

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    $\begingroup$ The approach accepted by the Funding Agency - have you asked them or checked the website or faq? $\endgroup$
    – Solar Mike
    Commented Nov 9, 2021 at 8:15

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