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A guide to commonly used terms within lighting
- 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).
- A lumen is a unit of measurement that is used to express how much illumination a source of light provides.
- 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
- A calculation of the efficiency of a fitting. Lumens (3000) ÷ Wattage (50W) = 60lpcW
- 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.
Cone diagrams describe the amount of light at different distances from a fitting and are measured by the lux level.