Building & Light - The light source: Quantities and Units

4 important questions on Building & Light - The light source: Quantities and Units

What is luminous efficiacy?

Is of electric light: luminous efficacy compares the luminous flux of an electrical source to the connected electrical power

What is the formula for lumnious efficacy?

Etha = Phi / P [lm/W]

What is the luminous intensity?

Relates the luminous flux emitted into a solid angle
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What is the formula for luminous intensity?

I = Phi/Omega [cd]

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