Room illumination

Good lighting in the room is one of the key factors for good mood and good health.
The level of light affects most of the basic processes of life:

  • Physical and psychological condition
  • Visual health
  • Nervous and immune system
  • Biological growth and development
  • Other factors...

Illuminance is a light quantity equal to the ratio of the luminous flux falling on a small surface area to its area. There are standard regulations that describe the necessary standards.
In Russia it is SanPiN и SanPiN (State Sanitary and Epidemiological Regulation of the Russian Federation)

Let's outline the key points.

3.1. General requirements

  • 3.1.1. Artificial lighting is divided into working and emergency lighting.
  • 3.1.2. Artificial lighting is divided into general and combined lighting.
  • 3.1.3. Work lighting should be provided for all rooms of buildings, as well as areas of open spaces for work, people and traffic.
  • 3.1.4. The normative value of illumination in these standards are set at its minimum value points on the working surface inside the premises.
  • For general and local artificial lighting, light sources with a color correlated temperature of 2400°K to 6800°K should be used.

As for lighting standards according to SanPin, we do not agree with them, so we will not cite them in our article.
Based on our extensive experience of lighting rooms for different purposes, we have compiled our table of values:

Destination Illuminances, lx (lux)
Bathrooms, toilets, showers 300
Bedrooms 350
Offices, workrooms, offices, representations 500
Children's 400
Pantries, Corridors 200

How to calculate illuminance

Professional calculation of illumination is simulated on the computer in the program Dialux.
But there is a faster (of course less accurate) way to determine - calculate luminance in the apartment. We at ULIGHT have derived a simple formula for calculating the main types of private lighting. LUM = LUX * H * K * S

  • LUM - is indicated on the luminaires (LEDs have an average of 80lm/w)
  • H - distance to the surface (ceiling height)
  • K - >1, Reflectance or transmittance (e.g., linear luminaires)
  • S - room area

The more obstacles to light, the more K
For example:

  • 1.3 - 70% screen transmittance at LED profile
  • 1.2 - about 20% is lost when of backlighting, on the double reflection from the wall