Illuminance level, precisely defined, is the measure of the intensity of light that falls upon a surface. It quantifies how much luminous flux (the perceived power of light) is spread over a given area.
According to the standard definition, illuminance (also known as illumination or LUX level) serves as the standard unit for measuring the intensity of light as it lands on a surface. Unlike measures of light emitted by a source, illuminance focuses on the effect of light on surfaces such as floors or walls in lighting design applications.
Understanding Illuminance and LUX
The concept is essential in ensuring adequate lighting in various spaces. It tells us how brightly a surface is lit, which directly impacts visibility and comfort.
- What it Measures: The density of luminous flux incident on a surface.
- Where it is Measured: On specific surfaces like floors, walls, desks, etc.
- Why it Matters: Crucial for lighting design to ensure spaces meet required lighting standards for activities performed there.
The Standard Unit: The LUX
The standard international (SI) unit for measuring illuminance is the LUX (lx). The reference provided (03-Feb-2021) confirms that the LUX level is the standard unit for measuring light level intensity and is known as illumination or illuminance, used to calculate the intensity of light falling on surfaces like floors or walls in lighting design.
Essentially, 1 LUX is equivalent to one lumen per square meter (1 lx = 1 lm/m²). This unit allows professionals to specify and measure whether a given area receives the appropriate amount of light for its intended use, ensuring everything from general ambient lighting to task-specific illumination is correctly implemented.
