A BREAKDOWN OF

LIGHTING TECHNOLOGY TERMS

Term

Explanation

Absence detection

Is a type of control which switches the lighting off, or dims it down, after the space becomes unoccupied, but where switching on is done manually.

CRI

Colour Rendering Index is a quantitative measure of the ability of a light source to reveal the colours of various objects faithfully in comparison with an ideal or natural light source.

Flicker Rate

Unless a person is in natural daylight, they are likely to be exposed to this higher frequency flickering, because all mains-powered light sources, whether incandescent, halogen, fluorescent or LED, are subject to flickering. The source is the AC component of the power supply and the frequency of the flickering is typically either equal to the mains frequency (usually 50 or 60 Hz) or double the mains frequency.

Lamp lumens

Means the sum of the average initial (1000 hour) lumen output of all the lamps in the luminaire.

Lamp lumens per circuit-watt

Is the total lamp lumens summed for all luminaires in the relevant areas of the building, divided by the total circuit-watts for all the luminaires.

LED

Short for light-emitting diode. An electronic semiconductor device that emits light when an electric current passes through it.

LOR

Is the light output ratio of the luminaire, which means the ratio of the total tight output of the luminaire understated practical conditions to that of the lamp or lamps contained in the luminaire under reference conditions.

Lumen Per Watt Ratio

Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power.

Luminaire lumens per circuit-watt

Is the (lamp lumens x LOR) summed for all luminaires in the relevant areas of the building, divided by the total circuit-watts for all the luminaires.

Photoelectric Control

Is a type of control which switches or dims lighting In response to the amount of incoming daylight.

Presence detection

Is a type of control which switches the lighting on when someone enters a space, and switches it off, or dims it down, after the space becomes unoccupied.

R9 Value

R9 is one of 6 saturated test colours not used in calculating CRI Butchers, bakers, surgeons and fashion retailers are among those who need their lights to render red really well.

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