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 Date: 2013-03-04 15:52:13Lighting Radiometry SI derived units Luminous flux Lumen Luminous efficacy Candela Luminous intensity Lux Photometry Measurement Physical quantities |
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Date: 2013-03-04 15:52:13Lighting Radiometry SI derived units Luminous flux Lumen Luminous efficacy Candela Luminous intensity Lux Photometry Measurement Physical quantities |
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Transport Canada Standard For LED Signal Modules At Highway/Railway Grade Crossings STANDARD TC E-14 Standard Approved October 10, 2003