GLOSSARY OF TERMS
DOUBLE INSULATION Also known as Class II, where two levels of insulation (such as two cable coverings) protect live parts from exposure.
DRIVER The driver is often the critical component in a LED luminaire or lamp, more so than the LED chip itself. The driver has to be matched to the power requirements of the LED chip and also have quality components. Drivers that use inferior components such as capacitors, will fail before the rated life of the LED chip, reducing the claimed life by as much as 50%.
EDGE LIT All LuxPanels are edge lit; this means that the LED chips are positioned vertically around the perimeter of the panel. This provides an excellent uniformly illuminated panel in a fixture as slim as 8mm.
EDISON SCREW A lamp cap that features a screw thread for a positive fit in the lampholder, common sizes include E15 and E27.
FIRE RATED Where a luminaire is installed in a fire barrier such as into a ceiling, it must have the same resistance to fire rating as that barrier. For domestic installations there are ratings of 30, 60 and 90mins and each limit must be tested for. A 90min rated product does not automatically comply with 30 or 60mins due to the different ceiling constructions. Non domestic applications usually have a fire resistant barrier such as a concrete slab between floors. So, do not have the requirement in many cases.
30min FIRE RATED
FLUX / LUMINOUS FLUX Luminous flux is the measure of the perceived power of light, adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light and is expressed in Lumens (lm).
F MARK
Denotes luminaires that can be mounted on to flammable surfaces as the heat generated will not cause any combustion. Previously luminaires that were suitable had to be marked, but the most recent standard requires only luminaires that don’t comply to be marked.
FREQUENCY Is the rate that the power supply wavelength fluctuates and is measured in Hertz.
GENERAL LIGHTING Lighting to illuminate the general area without supplementary task lighting.
E15 E27
EFFICACY Is the measure of how efficient a lamp or luminaire is. This can be expressed as (source) lumens per watt, which is the normal measure for lamps. Or, as luminaire lumens per circuit watt that is common for luminaires. The figure for luminaires will also include the LOR of the luminaire in the calculation.
Lm/W 60 GLARE
Is difficulty seeing in the presence of bright light such as direct or reflected sunlight or artificial light and is proportional to the background illuminance, a good example is a car headlight that provides glare at night time but not during the day.
GONIOPHOTOMETER A photometric device for testing the luminous intensity distribution, efficiency, and luminous flux of luminaires.
EMERGENCY LIGHTING Is to allow the safe evacuation of an area in the event of a mains failure. The positioning and number of emergency lighting luminaires is detailed in a British Standard, BS5266. It is vital that emergency lighting is maintained correctly to ensure batteries are conditioned so it operates when required.
HEAT SINK
A part of the thermal system that conducts or convects heat away from sensitive components, such as LEDs and electronics.
HERTZ (HZ) The unit to measure frequency.
HIGH POWER LED A high power LED, sometimes referred to as a power LED, is one that is driven at a current of 350mA or higher.
ESCAPE ROUTE Emergency lighting along a route such as a corridor or staircase to enable safe evacuation.
HIGH RISK AREA A requirement in Emergency lighting where a process may require safe shut down or an increased hazard. Higher emergency lighting levels are therefore required local to the risk.
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TECHNICAL
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