... whitening .4. Unique design of light head, wide range of irradiation, moreover, the light gets vertical with every teeth, ... evenly.5 Certain distance between the light head and cheek retractor, make sure the head light is clean, prevent cross infection ... 220V, 50/60HzLED life expectancy :150,000hoursBlue LED light Intensity: 168888uW/cm2Blue wavelength: 465nm470nmLight intensity: 7000MCDMagnify Lens ...