Lighting products

Lighting products

Industry: Lights & lighting

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Lighting products

Fluorescence

Lights & lighting; Lighting products

A physical phenomenon whereby an atom of a material absorbs a photon of light an immediately emits a photon of longer wavelength. If there is a significant delay the phenomenon is called ...

A high efficiency lamp utilising an electric discharge through inert gas and low pressure mercury vapour to produce ultraviolet (UV) energy. The UV excites phosphor materials applied as a thin layer ...

Foot candles

Lights & lighting; Lighting products

A unit of illuminance or light falling onto a surface. It stands for the light level on a surface one foot from a standard candle. One footcandle is equal to one lumen per square foot. See also Lux.

Footlambert

Lights & lighting; Lighting products

An obsolete term referring to a luminance of 1/? candelas per square foot.

Four-pin compact fluorescent lamps

Lights & lighting; Lighting products

A "plug-in" compact fluorescent lamp with 4 pins in the base to make electrical contact with the ballast.

Fovea, foveal vision

Lights & lighting; Lighting products

A small region of the retina corresponding to what an observer is looking straight at. This region is populated almost entirely with cones, while the peripheral region has increasing numbers of rods. ...