The intensity of LED lights could be estimated by an exclusive measuring principle on which the Bluephase meter operates. The instrument makes use of a light emission window, which is circular in shape, in order to measure the intensity of LED lights. Unlike traditional radiometers, this device has been successful in gaining customers by means of a unique mechanism of measurement, by taking into consideration the radiating surface. This further enables accuracy of the Bluephase meter in the estimation of the actual available intensity of light for the first time. The light emission window's diameter and emitted power are both measured by the intelligent line sensor of the equipment. Subsequently, the available intensity of light is accurately estimated by an integrated micro-processor, taking these data into account. The user benefits from a very simple measuring procedure. The centering gauge places the light probe in a perfect manner on the line sensor. After switching on the curing light, the intensity of light gets displayed on the digital.