Optical design of dental light using a remote phosphor light-emitting diode package for improving illumination uniformity

The projection-type dental lighting based on the remote phosphor light-emitting diode (LED) package is designed to enhance uniformity of illuminance and correlated color temperature (CCT) on a target plane and to remove glare in the eyes of the patient. This dental lighting enables dentists to illuminate effectively the patient’s mouth by increasing the inner area (50  mm×25  mm) described in ISO 9680. The optical module comprised of the LED package and optical lens is modeled to satisfy the inner area wider than 100  mm×50  mm and illuminance over 5,000 lx per the designed optical module. The fabricated prototype dental lighting contains four optical modules, and the maximum illuminance is 22,786 lx. The measured inner area is 105  mm×74  mm, and the ratio of inner area to outer area is about 76%. Also, the CCT variation is below 450 K in total illuminance pattern.