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A tri-proof luminaire is protected against three things: water, dust and impact. Ideal for garages, warehouses, car parks and workshops.

A dimmable LED high bay can give less light when that is sufficient. This is usually done via 1-10V, 0-10V or DALI, optionally with sensors.

An anti-glare lens on an LED UFO high bay limits the bright light from the LEDs, so that staff in halls and warehouses are dazzled less.

Anti-glare glass or an anti-glare lens spreads the bright LED light so that it dazzles less. The result is calmer light and less eye strain.

Insects are mainly attracted by blue light and UV. Warm, yellowish LED light attracts noticeably fewer insects, but does not drive them away.

LED tubes come mainly as T8 (26 mm, G13) and T5 (16 mm, G5), in lengths of 60, 90, 120 and 150 cm. They are an efficient replacement for old fluorescent tubes.

E27, E14, GU10 and GU5.3 are codes for a lamp's cap (base). The letter tells you the type of connection, the number the size in millimetres.

You can mount an LED panel in three ways: recessed in a suspended ceiling, surface-mounted with a frame or suspended with a pendant kit. Here is how, step by step.

RGBWW is LED lighting with red, green and blue LEDs plus warm white and cool white LEDs. This lets you create any colour as well as pure white light.

UGR (Unified Glare Rating) indicates how much discomfort glare lighting causes. For office work, UGR 19 or lower is the standard.