Luminous intensity - The amount of light emitted , Luminous flux - The total amount of light emitted from a source, Illuminance - The amount of light falling on a surface., Glare - A very bright light that is difficult to look at, Maintenance factor - Factors used to derate the light output of a lamp, Light loss factor - The factor used depends on the environment, Utilisation factor - Light bounces off reflective walls, making more effective use of the light,

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