Lighting explained

A guide to commonly used terms within lighting

Lighting Explained
  • 1. Wattage (VA) - A measure of the energy consumed by a fitting

    A measure of power or the rate of energy consumption of an electrical device when it is in operation, calculated by multiplying the voltage at which an appliance operates by the current it draws (Watts = Volts X Amperes).
  • 2. Lumens - A measure of light output

    A lumen is a unit of measurement that is used to express how much illumination a source of light provides.
  • 3. Light output ratio (LOR) - The proportion of light that finally leaves the light fitting

    This is a measure of the efficiency of the fitting and is a ratio of the lumens leaving the light source and the lumens that finally leave the fitting
  • 4. Lumens per circuit Watt (LpcW) - The efficiency of the fitting

    A calculation of the efficiency of a fitting. Lumens (3000) รท Wattage (50W) = 60lpcW
  • 5. LUX - A measure of light intensity

    A measure of the intensity of light as seen by the human eye and is measured by luminous flux per unit area. One lux is equal to one lumen per square metre.

Understanding colour temperature

The colour temperature of a light source is measured in degrees Kelvin. Below is a Kelvin temperature chart with examples of how colour temperature is used within different lighting applications.

Colour Temperature

Cone diagrams

Cone diagrams describe the amount of light at different distances from a fitting and are measured by the lux level.

Cone diagrams

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