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Guide to light sources​​

 

Basic definitions

Lumen
Unit of measure of the luminous flux.
Lux
Unit of measure of illuminance, lumen per square meter.
Watt
Expresses the quantity of energy (power) absorbed.
Lumen/Watt
Expresses the efficiency of the light source: how many lumens per watt.

Colour Temperature (expressed in degrees Kelvin)

Very Warm: < 2700 K Warm White: 2700 – 3000 K
Cold (Natural) White: 3000 – 4000 K
Very Cold: > 4000 K

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