Power, brightness and lighting of an LED

Power, brightness and lighting of an LED


led light

The lighting power of an LED is often referred to as Watt, Lumen or Lux. What do these terms really mean and what is the difference between each?

The Watt

The Watt is a measure of the power consumed by the lamp. Historically it was also a measure of the light output of the lamp (e.g. 75W incandescent bulb). Now, modern bulbs are much more efficient, which means that the power consumed is no longer a good way to know the luminous flux produced by the bulb. Indeed, a 100W incandescent bulb, low consumption of 25W and a 15W LED bulb produces the same light while having very different electrical consumptions.

The lumen

The lumen measures the total amount of light emitted by a light source. It is strictly speaking a measure of the "quantity of light", the luminous flux of the lamp. The higher the number of lumens, the brighter the bulb illuminates.

Attention, the light of 500 lumens with an angle of diffusion of 60 ° and with an angle of diffusion of 360 ° will produce two very different light atmospheres. The 60 ° angle will powerfully illuminate a well-focused spot - the light is directed in a particular direction. The 360 ​​° angle will brighten more weakly but in all directions.

The Lux

Lux measures the amount of light on a given surface. 1 lux = 1 lumen / m². According to the rooms of the house or the activities the advised lighting is different, as an example here are some values ​​of enlightenment advised:


  • ·         garage, attic: 50/70 lux
  • ·         room 100 to 150 lux (add a bright spot for reading)
  • ·         living room, dining room, bathroom: 100 to 250 lux
  • ·         office, workspaces: 200 to 400 lux


When choosing your LED bulb, it is important to look closely at the lumen number and lighting angle to get the desired result. Generally:


  • ·         to replace an incandescent bulb, use equivalent LED street lights with a wide angle (270 ° or more)
  • ·         to replace a halogen spot, use LED spots with the angle of 60 ° or more

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