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This light-curing unit (LCU) had an averaged radiant exitance of 1,822 mW/cm2. The figure depicts the anticipated beam profile (a) that was obtained from the quotient of the power and area (as per the ISO 10650 standard). (b) The actual scaled irradiance beam profile of the same LCU showing that although the average radiant exitance is still 1,822 mW/cm2, there are four ‘hot spots’ where the radiant exitance is above 12,600 mW/cm2 surrounded by regions of lower radiant exitance.
