Motor on = LED on. The unique Alegra range of contra-angles from W&H generate their own LED light. This means that you can use them with any dental micro motor, regardless of whether your unit is optic or non-optic. An in-built generator acts as the energy source for the LED and operates according to the same principle as a bicycle dynamo. The self-generated LED light is of daylight quality, is neutrally-coloured and is many times brighter than a conventional halogen light, providing excellent illumination of the entire mouth.