The six LCUs delivered significantly different light output characteristics.
The use of a single irradiance value does not adequately describe the light output from a curing light.
Small differences in the tip area, or how it is defined, will have a large effect on the calculated irradiance.
In some cases there were large portions of the light tip that emitted less than 400 mW/cm².
The radiant power, active tip diameter, emission spectrum, and light beam profile of the light source should be provided.