Lighting

Lighting

Industry: Construction

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Lighting

voltage

Construction; Lighting

The difference in electrical potential between two points of an electrical circuit.

zenith

Construction; Lighting

The direction directly above the luminaire (180 angle).

The color temperature is a specification of the color appearance of a light source, relating the color to a reference source heated to a particular temperature, measured by the thermal unit Kelvin. ...

ballast efficiency factor (BEF)

Construction; Lighting

The ballast factor divided by the input power of the ballast. The higher the BEF within the same lamp-ballast type, the more efficient the ballast.

ballast factor

Construction; Lighting

The ballast factor (BF) for a specific lamp-ballast combination represents the percentage of the rated lamp lumens that will be produced by the combination.

shielding angle

Construction; Lighting

The angle measured from the ceiling plane to the line of sight where the bare lamp in a luminaire becomes visible. Higher shielding angles reduce direct glare. It is the complementary angle of the ...

specular

Construction; Lighting

Mirrored or polished surface. The angle of reflection is equal to the angle of incidence. This word describes the finish of the material used in some louvers and reflectors.