UV cure dose.

The total ultraviolet energy delivered to each square centimeter of a print as it passes the lamp, measured in mJ/cm² and equal to irradiance summed over the time of exposure. Dose is not lamp wattage, and two lines reporting the same dose can cure differently, because peak irradiance drives how deep the cure goes: a weak lamp run slowly is not the equivalent of a strong lamp run fast. A reading also means something only for the wavelength band the radiometer covers, and only when it is taken at the surface being cured, which is why a puck sent through the machine beats the number on the control panel. Lamp output falls off gradually, so an unmeasured line drifts under-dosed and ships work with a cured-looking skin over soft ink that fails on adhesion after it has left the building.