Illuminance

What is illuminance?

The Illuminance describes the amount of Light, which strikes a specific surface. It is a fundamental value of the Lighting and indicates how brightly a surface is illuminated and which Brightness can be perceived there.

Unit of illuminance

Illuminance is measured in Lux measured. One lux corresponds to the amount of light from one lumen distributed evenly over an area of one square meter.

The value in lux therefore indicates how much light actually falls on a surface. The higher the lux value, the greater the brightness in a room or on a work surface.

Significance for Lighting

Illuminance is an important parameter in lighting design. It determines how well details, textures, or colors can be perceived.

Adequate illuminance ensures that a surface is evenly lit and that visual tasks can be performed under stable lighting conditions. In addition to the amount of light, the distribution of light within the room also plays a role.

Factors Affecting Illuminance

The actual illuminance on a surface depends on several factors. These include:

• the power and position of the light source
• the distance between the light source and the surface
• the distribution of lighting in the room
• the reflection off surfaces

These factors influence how much light reaches a surface and the brightness that results there.

Illuminance in Lighting Design

In lighting design, illuminance is used to define the required brightness for different areas. This involves calculating how much light is needed to illuminate a surface to a specific lux value.

Illuminance thus serves as a technical measure for describing the effect of light and the quality of lighting in indoor spaces or work areas.