Discover the difference between Lumen and Lux

In today's article we will address two basic technical lighting concepts: Lumen and Lux. These units of measurement are often addressed during a lighting project, making understanding them critical.

Lumen

The lumen (lm) is a unit that determines the amount of luminous flux emitted by a light source.

For example, a candle has approximately 13 lumens, while the Sun emits about 100,000 lm. That is, the higher the value, the greater the luminous intensity.

Lux

The lux (lx) determines the luminous flux emitted by a light source falling on a surface.

In this case, the area of ​​the room in question is taken into account, as well as the color of the walls and the distance/height at which the luminaire is placed.

Lux = Lumen/m²


What are these units for?

These units help the selection of lighting equipment for a space, both at the time of purchase and during the preparation of projects. Additionally, these concepts help to determine the number of luminaires that should be applied in each environment, in order to provide the best possible visual comfort.



Now that you are aware of the difference between lumens and lux and the importance of these concepts in lighting, know that at Tromilux we have professionals specialized in lighting studies who can answer any questions that may arise.