Question

Lighting intensity requirements are typically based on a unit of measurement called a what?

A) Lumen
B) Watt
C) Lux
D) Kelvin

Answer 1

The unit of measurement typically used to determine lighting intensity requirements is called lux (lx). Lux is a measure of illuminance, which refers to the number of lumens per square meter falling on a surface at a specific distance from the light source.

Step-by-step explanation:

The unit of measurement typically used to determine lighting intensity requirements is called lux (lx).

Lux is a measure of illuminance, which refers to the number of lumens per square meter falling on a surface at a specific distance from the light source. It is different from luminous flux (measured in lumens), which represents the total amount of light radiated from a source.

For example, if a light bulb has a luminous flux of 2000 lumens and is placed 3 meters away from a surface, the illuminance on that surface would be calculated using the formula: illuminance (lx) = luminous flux (lm) / area (m²) = 2000 lm / (4π(3m)²) ≈ 8.33 lx.