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Light output calculations lux = candela / distance , Light output calculations lux = candela / distance meters * distance meters foot-candles = candela / distance feet * distance feet. Lux - wikipedia, Illuminance measure luminous flux spread area. luminous flux (measured lumens) measure . Lumens-lux calculator - ledstuff, Lux: lux (illuminance) measurement light intensity point. equal 1 lumen square meter. room type): supplied small list.