Standard light intensity for each space

Light intensity is one of the important criteria affecting lighting efficiency and user visibility. Therefore, to keep our eyes safe and create the most favorable light environment during work or relaxation, it is essential to determine the appropriate standard light intensity for each situation.

What is light intensity?

  • Light intensity is a parameter to determine the energy emitted from a light source in a fixed direction. In other words, when each light source emits 1 candela, that light source also emits 1 lumen in a fixed direction.
  • The unit of light intensity is Candela (cd). 1 Candela = 1 lm/Sr
  • The symbol for standard light intensity is I (Intensity).

Light intensity Lux

  • Lux light intensity is an output unit that is calculated for the light output per unit area (m2), also known as illuminance.
  • 1 Lux is the light intensity produced by a candle shining on a surface from 900cm2 - 1m2.

Why is light intensity important?


For manufacturing factories, when the light reaches the standard intensity, it will not cause discomfort to workers, avoid stress, and help increase labor productivity with high product quality.

In addition, when calculating the appropriate light intensity, it will help to accurately assess the effectiveness of the lighting system, select equipment. LED lights suitable lighting and saving energy costs.

What is the recommended standard light intensity in each case?

Lighting intensity has different requirements depending on the type of space. Therefore standard light intensity There are also differences between regions to ensure the most appropriate activities.

Here are some recommended light intensity standards based on each space as follows:

  • General lighting of the kitchen : 300 lx
  • Lighting on the worktop in the kitchen: 500-600 lx
  • Shared bathroom lighting: 200 lx
  • Bathroom mirror lighting: 300-500 lx
  • General lighting of the bedroom: 100-200 lx
  • General lighting of the living room: 100 lx
  • Brightness for watching TV: 50-70 lx
  • Illumination of desk or reading area: 500 lx
  • Stair or corridor lighting: 100-300 lx
  • General lighting of a commercial premises: 300-600 lx
  • General lighting of a school: 350-1,000 lx
  • General lighting in the gym: 250-500 lx
  • Illumination of medical facility waiting room: 300-600 lx
  • Illumination of consulting rooms of medical facilities: 400-1,000 lx
  • Lighting in the operating room: 3,000-8,000 lx
  • General lighting in restaurant dining room: 100-600 lx
  • General lighting of a hotel : 100-400 lx
  • General office lighting: 400-700 lx

As we can see, the need for lighting levels varies considerably from space to space and depending on the type of activity being performed. In order to create a visually comfortable and safe space, it is essential to take into account light intensity factors and tailor the lighting to the particular circumstances. In this way, we will take care of our eyes and health in the best way.