Crescent CCT Multi Wattage

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The definition of glare is the visual sensation caused by an excessive and uncontrolled brightness of light within the individual’s field of view.

There are two forms of glare, Disability Glare which is defined as directly impairing vision and Discomfort Glare which is defined as perceived discomfort.

There are two types of Glare. Direct Glare which is caused because of high levels of brightness from a light source. Indirect Glare, which is caused by reflected brightness, where the direct light from the source is reflected off a bright surface.

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Firstly, the installation of any lighting control within an application can provide significant benefits, not only in energy saving, but also in the continued specified performance and the economic life of the lighting fittings.

There are three basic types of control to consider.

Photo Electric Cell Units are basically a switch which operates automatically based upon the amount of ambient light and their function is in two different operations, to switch the lighting on when the ambient lighting level falls below a given value and to switch the lighting off when the ambient lighting level rises above the given value.

Microwave sensors operate by emitting a high frequency microwave beam over a designated area and when that beam is invaded by motion, this determines presence and activates the lighting to be switched on. An ideal solution for external lighting applications as they do not require a hole to be cut into the luminaire.

Passive Infra-Red Sensors (PIR) are electronic sensors which measure Infra-red light radiating from objects within the field of view, working where infra-red radiation enters the segmented front.

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Yes, with equipment that facilitates this, normally a dimmable LED driver, along with a suitable dimmer switch. All of our LED products are highlighted in our catalogue as either “dimmable” or “non-dimmable”.

Light sources all have a colour temperature which will dictate whether the light emitted is either of a warm colour, an intermediate or neutral colour, a cool colour or a cold colour. The higher the colour temperature, the cooler, the colour appearance of the light source. The Colour Temperature is a description of the warmth or coolness of a light source. It is most simply, a method of demonstrating the colour characteristics of light, usually either as warm (yellowish) colour or a cool (bluish) colour.

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The beam angle is the point at which the light output Lumens drop below 50% of the total light output. LED beam angles typically vary between 10° - 120°. The beam angle is the area where the light is at its most intense.

All light sources degrade over time. LM80 is the method for measuring how much lumen depreciation the light source will suffer. This is not to be confused with an estimation of life. LED's typically do not fail as they have no filament to burn to end their life, rather degrade beyond useful life output.