Luminaires
 
Non-cutoff luminaires (NCO)
Non-cutoff luminaires (NCO)
Non-cutoff luminaires are subject to no limit on the proportion of luminous flux that is emitted above the horizon and in the glare zone.


Semi-cutoff luminaires (SCO)
Semi-cutoff luminaires (SCO)

Semi-cutoff luminaires emit between 0 and 31% of the luminous flux above the horizon. There are further criteria.

    1. Above the horizon: Luminous intensity (in candelas) must be less than 5% of the total luminous flux (in lumens).
    2. Glare zone: Luminous intensity (in candelas) must be less than 20% of the total luminous flux (in lumens).

A semi-cutoff luminaire of 1,000 lm, for example, can emit up to 50 candelas in all lateral angles above the horizon and less than 200 candelas in all lateral angles in the glare zone.



Cutoff luminaires (CO)
Cutoff luminaires (CO)

Cutoff luminaires emit between 0 and 16% of the luminous flux above the horizon. There are further criteria.

  • Above the horizon: Luminous intensity (in candelas) must be less than 2.5% of the total luminous flux (in lumens).
  • Glare zone: Luminous intensity (in candelas) must be less than 10% of the total luminous flux (in lumens).


Full-cutoff luminaires (FCO)
Full-cutoff luminaires (FCO)
Full-cutoff luminaires emit no luminous flux above the horizon.  Luminous intensity in the glare zone (in candelas) must be less than 10% of the total luminous flux (in lumens).


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