Luminous Intensity describes the quantity of light that is radiated in a particular direction. This is a useful measurement for directive lighting elements such as reflectors. It can be expressed as
I = Φ / Ω (2)
I = luminous intensity (lm/sr, candela, cd)
Φ = luminous flux (lumen, lm)
Ω = solid angle (the amount of the field of view from some particular point that a given object covers) into which luminous flux is emitted (steradians, sr)
A specific application requires 500 lumens of light.
The required power to a tungsten incandescent lamp with luminous efficacy 15 lm/W can be calculated by modifying (1)
P = Φ / η
= (500 lm) / (15 lm/W)
= 33 W
The required power to a LED lamp with luminous efficacy 70 lm/W can be calculated by modifying (1) to
P = Φ / η
= (500 lm) / (70 lm/W)
= 7.1 W
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