Abstract: The present invention device is used for curing photopolymerizable products and includes a converging type cold mirror, an ultraviolet light source, a heat absorber behind the cold mirror, a back deflector behind the heat absorber, and a blocker tube and an ultraviolet light permeable window located in front of the ultraviolet light source. The various elements are arranged so as to provide four different air channels (two longitudinal currents and two cross currents) for cooling, enabling the device to be operated at greatly reduced temperatures as compared to prior art air cooled devices.