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Common Terminology when discussing lighting accessories

Friday, 24 April 2015  |  Admin

kWh – The term Kilowatt-hour is a unit of energy equal to 1,000 watt-hours. This is the amount that a 1,000w devise uses in 1 hour – alternatively what a 1w devise used in 1,000 hours. Your electricity bill is counted in these units.


CFL – Often referred to as energy saving lamps, compact fluorescent lamps deficiencies in colour, power and the time it takes them to reach full output.


PIR  - Short for passive infrared. PIR sensors are electronic sensors that measure infrared light radiating from objects in their field of view. It can detect heat from objects that is undetectable from humans. PIR is one of the main technologies used for presence and absence detection. To turn lights on and off when people are or aren’t there.


CRI – Short for colour-rendering index. CRI is the ability of a light source to show the colours of objects properly. Lamps with poor colour rendering will distort some colours. The higher the CRI, on a 0-100 scale, the more accurately the lamp will show colour.


Colour temperature – Colour temperature describes whether a light source appears warm or cool – indicated by the correlated colour temperature (CCT). Lamps with a warm appearance have a CCT of 2700-3000K and are considered appropriate for domestic setting. Cooler lamps might be 4000k and are used more often in offices and retail. The higher the colour temperature, the cooler the appearance.


LUX – Lux is the unit of illuminance – a measure of how much luminous flux (in lumens) is spread over a given area (in square metres). It tells you how much light is arriving at a surface. 1lm.m2 equal 1lx. Multiply an illuminance figure in lux by an amount of time in hours and you have a measure of exposure in lux hours.

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