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Why is this measured in foot candles instead of the way we would measure curing lights in mW/cm²?

April 26, 2017candles curing foot lights measure measured mw

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Why is this measured in foot candles instead of the way we would measure curing lights in mW/cm²?

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Photometric measurement (foot candles) is the way visible light is measured because that is the way the human eye sees light. Curing lights are measured in radiometric units (mW/cm²) and cannot be compared to photometric measurements.