Electrical illumination (lightning) design - lux levels

Lumen is a SI unit of light, which is also known as Luminous flux. Lumens (LM) are a measurement unit, which tells what the total amount of light emitted from a light-source or lamp. You can roughly say that the more Lumens the brighter the light. 


Lux is a unit of light measurement where the area is also taken into account. 1 = 1 Lumen/SqMtr,  ( light intensity in a specific area ). Lux meter is used to measure the amount of light output in a given area. 

A light engineering term exists for the measurement of the rate at which a lamp is able to convert electrical power (Watts) to Light (Lumens) – this is referred to as "luminous efficacy" (or just efficacy) – and is expressed in Lumens per watt. 

Choose your lights properly for energy saving. 

Recommended Lux levels for buildings: