Aurora Lighting Brochure 2025

Lighting Terminology

simply failing. As an example, a 1000 lumen LED luminaire at L70 to 35,000 hours will deliver at least 700 lumens after 35,000 hours of operation. L80 Life Time The point at which the LED’s output has reduced to 80% of it’s original value, usually measured in thousands-of-hours. LED light sources depreciate slowly over time rather than simply failing. As an example, a 1000 lumen LED luminaire at L80 to 35,000 hours will deliver at least 800 lumens after 35,000 hours of operation. Intumescent Material Material used within Fire Rated Downlights and gaskets, it expands to form a fire rated barrier once exposed to fire. UGR UGR or Unified Glare Rating is a calculation based on the level of glare which will be present in a certain application. For instance, UGR19 in an office application will provide a comfort light for those working under a panel or downlight. However should there be a UGR22 rating or high, there could be a visible glare impacting productivity. BESA Mounting Points When replacing traditional fluorescent with an LED alternative, having BESA mounting points provides the a like for like replacement perfect for a simple retrofit. PIR A PIR is a presence detector that can turn on a lighting circuit through the detection of a moving object. Microwave Sensor Products which have a microwave sensor option provide an energy saving version that will provide little to no light output until a human target is identified. Causing the fitting to illuminate to the full light output. Maintained (Emergency Products) Maintained emergency lighting luminaires are built to be active continuously in everyday life and through the event of a power cut. Just like a normal luminaire, when running they will take power from the mains supply, but when they switch to emergency mode they take power from a backup battery. Non-Maintained (Emergency Products) Non-maintained emergency lighting is a luminaire made solely for emergency use. It is designed to come on in the event of a mains power failure, making sure all emergency exit routes are clearly illuminated, but will not be active as your normal day-to-day lighting system. IK Rating IK ratings are defined as IKXX, where “XX” is a number from 00 to 10 indicating the degrees of protection provided by enclosures for luminaires against external impacts, measured in joules (J).

Wattage A measure of power or the rate of energy consumption by 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). Lumens A lumen is a unit of measurement used to express how much illumination a light source provides. Lumens per Watt A statement of a light’s efficiency which is calculated by dividing the total lumen output of a fixture by its Wattage. The higher the Lumens per Watt, the more efficient a product is at converting electricity into light. For example: A 50W GU10 halogen produces approximately 400 lumens and consumes 50W of power. Therefore where 400 ÷ 50 = 8, it produces around 8 lumens per 1 Watt of electricity A lamp could produce 520 lumens, but consumes just 5W of power. Therefore, where 520 ÷ 5 = 104, it produces 104 lumens per 1 Watt of electricity Lux A measure of a light’s intensity as seen by the human eye, measured by luminous flux per unit area. One lux is equal to one lumen per square metre. SDCM SDCM stands for Standard Deviation Colour Matching and details a colour within which the human eye cannot discern colour difference. The lower the SDCM, the higher the colour consistency you can see across the LEDs. Colour Rendering Index (CRI) A measure of the ability of a light source to reproduce the colours of various objects. A minimum CRI of 80 is recommended for most general domestic and commercial applications, but CRI90+ can be beneficial for some environments, e.g. retail. Lumen Depreciation (L70) Lumen depreciation values reflect the overall performance of a light source through its life. Although still operational, all fixtures will experience a level of lumen depreciation. A L70 value states after how many hours in operation the product will produce 70% of its original lumen output. For example, a fixture that produces 1,000 lumens with a L70 50,000 hours means that after 50,000 hours operation, the lumen output will have dropped to around 700. L70 Life Time The point at which the LED’s output has reduced to 70% of it’s original value, usually measured in thousands-of-hours. LED light sources depreciate slowly over time rather than

TERMINOLOGY AURORA ®

Degrees of Protection against external mechanical parts IK00 IK02 IK03 IK05

IK06

IK07

IK08

IK09

IK10

IK00

Non-protected

0.2J

0.35J

0.5J

0.7J

1J

2J

5J

10J

20J

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