How many LED Lights or bulbs for a room?

How many LED Lights or bulbs for a room?

When you want to size or change the lighting, one of the first questions that arise is to determine the number of light points needed. The idea is to find how many Lights to install on the ceiling or per m².

Determine the number of Lights using lux

In order to reliably calculate the number of LED Lights per room, we advise you to use the luminance that is expressed in lux. Lux is the unit of measure for luminance (symbol: lx). It characterizes the luminous flux received per unit area (1 lux = 1 lumen / m²)

A lux is the illumination of a surface that receives, in a uniformly distributed way, a luminous flux of one lumen per square meter.

We also have an equivalence between the bulbs. You can quickly determine the number of lux you need according to the type of room, using the following table given by the standard NF EN 12464-1

How to calculate the total brightness to bring?

When you have determined the luminance in lux according to your room type, the following calculation must be made.

What is the precision of this calculation?

This quick calculation gives an idea of ​​the number and type of Lights to install. Factors such as lighting angles, wall color, floor color and furniture influence the final rendering. This calculation considers a uniform and general lighting throughout the room (including corners): to obtain greater precision, it is necessary to work by zone and not by room. For ambient lighting and functional lighting, accent Lights should also be used.