2 Terms
Contributors in Lighting
Lighting
downlight
Construction; Lighting
A type of ceiling luminaire, usually fully recessed, where most of the light is directed downward. May feature an open reflector and/or shielding device.
Footcandle (FC)
Construction; Lighting
The English unit of measurement of the illuminance (or light level) on a surface. One footcandle is equal to one lumen per square foot.
Glare
Construction; Lighting
The effect of brightness or differences in brightness within the visual field sufficiently high to cause annoyance, discomfort or loss of visual performance.
Voltage
Construction; Lighting
The difference in electrical potential between two points of an electrical circuit.
Colour temperature
Construction; Lighting
The colour temperature is a specification of the colour appearance of a light source, relating the colour to a reference source heated to a particular temperature, measured by the thermal unit ...
Room cavity ratio (RCR)
Construction; Lighting
A ratio of room dimensions used to quantify how light will interact with room surfaces. A factor used in illuminance calculations.
