The input power (wattage) of the lamp ...
The following lamps shall be excluded from the scope of this Directive ... those with an input power of less than 4 watts ...
Switch on the electricity supply and establish the power input of the controller required to produce irradiance at the centre of the radiator surface of 3 W/cm?. Adjustment to the power unit to record 3 W/cm? should be followed by a five minute-period without further adjustment to ensure equilibrium.
