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Spotlights
Altman 360Q


Floodlights
Fresnels


Optical Formulas:
coefficient = beam spread / throw
coefficient = beam angle * 0.018
beam angle = coefficient / 0.018
beam angle = beam spread / (0.018 * throw)
beam spread = coefficient * throw
beam spread = 0.018 * throw * beam angle
footcandles = beam candlepower / (throw * throw)