Lighting

Lighting

Industry: Construction

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Lighting

Low power factor

Construction; Lighting

Essentially, an uncorrected ballast power factor of less than 0.9 (SEE NPF)

Footlambert

Construction; Lighting

English unit of luminance. One footlambert is equal to 1/p candelas per square foot.

Occupancy sensor

Construction; Lighting

Control device that turns lights off after the space becomes unoccupied. May be ultrasonic, infrared or other type.

Stroboscopic effect

Construction; Lighting

Condition where rotating machinery or other rapidly moving objects appear to be standing still due to the alternating current supplied to light sources. Sometimes called "strobe effect."

Underwriters' laboratories (UL)

An independent organisation whose responsibilities include rigorous testing of electrical products. When products pass these tests, they can be labelled (and advertised) as "UL listed." UL tests for ...

Maintained illuminance

Construction; Lighting

Refers to light levels of a space at other than initial or rated conditions. This terms considers light loss factors such as lamp lumen depreciation, luminaire dirt depreciation, and room surface ...