GLOSSARY OF TERMS
CLASS II Class two luminaires do not require an earth connection and are also referred to as double insulated.
COLOUR APPEARANCE Term used to describe how ‘white’ the emitted light looks. Commonly, warm, neutral, cool and daylight are used to categorise.
CORRIDOR FUNCTION Refers to luminaires that when not required to emit 100% light output, switch to 10% output. This ‘standby mode’ allows the luminaire to provide a low level of illumination for a feeling of security so the area is not totally dark. Upon sensing movement the output automatically and instantly switches to 100%. This is particularly useful in circulation areas such as corridors and stairwells.
100%
COLOUR RENDERING INDEX (CRI) A measure of the degree of colour shift objects undergo when illuminated by the light source as compared with those same objects when illuminated by a reference source of comparable colour temperature. The reference source has a CRI of 100. Natural light (daylight) would also be 100.
CRI > 90 EXCELLENT
CRI > 80 GOOD
90º
CRI > 70 POOR
CORRELATED COLOUR TEMPERATURE (CCT) The description used to describe the effect of heating an object until it glows incandescently, the emitted radiation, and apparent colour, changes proportional to the temperature; easily envisioned when considering hot metal in a forge that glows red, then orange, and then white as the temperature increases. Measured in degrees Kelvin.
<3300K WARM WHITE 3300K - 5300K NEUTRAL WHITE >5300K
COOL WHITE
Cutoff Angle
66º
Cutoff Angle
No
Cutoff Angle
10%
CUT-OUT DIMENSION Size of hole required to install luminaire.
CUT OFF ANGLE Small downlights can appear too intense and very glary, so cut off angle illustrates the point where the light source can’t be seen.
DALI Stands for Digital Addressable Lighting Interface, where each driver and control component such as a sensor or switch has a unique address on the lighting installation. This allows for infinite configuration of the lighting installation and flexibility in the future.
DIMMING Many Luceco luminaires are available as a dimmable version option. Generally this requires a different driver to the standard fixed output driver and also may require additional wiring on site to operate/control the dimming function.
WARM 2700K
WARM WHITE 3000K
WHITE 4000K
COOL WHITE 5000K
DAYLIGHT 6500K
DIRECT LIGHTING Luminous flux that reaches the working plane without being reflected from walls/ ceiling or within the luminaire itself.
DLOR Downward Light Output Ratio is the percentage of luminous flux output from the lamp/luminaire that is emitted in the 180˚ angle below horizontal.
%
154
LIGHTING POSSIBILITIES
TECHNICAL
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