Photometric Terms Lumens: Also known as Luminous Flux, which is measured in lumens (lm), is the total amount of light produced by a light source without regard to direction. The luminous flux is provided by lamp manufacturers and common lumen values are included in the lamp matrix. Candela: Luminous intensity, measured in candela (cd), is the amount of light produced in a specific direction. Graphically, this information is compiled into polar formatted charts that pinpoint the intensity of light at each angle away from 0° lamp axis (nadir). The numeric information is also available in tabular...


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