Building & Light - The observer; light quantities and units related to vision

5 important questions on Building & Light - The observer; light quantities and units related to vision

What is the formula for illuminance?

E = Phi/A [lx]

What is the formula for luminance?

L = I/A_apparent [cd/m^2]

What are primary sources and secondary sources?

Primary sources are the sun or a light bulb and secondary sources are surfaces that reflect light they receive from elsewhere.
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What is the formula that allows us to calculate the luminance of a Lambertian radiator?

L = E *rho/pi

What is the formula for the inverse square law?

E = I/r^2 * cos(epsilon_2)

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