For UV curing, the two basic optical elements that control energy at the irradiation zone are UV Cold Mirrors and UV Hot Mirrors. NTFL UV cold mirrors reflect UV energy while removing heat-producing visible and infrared energy. The removal of visible and infrared energy can be accomplished by transmitting the visible and infrared energy through the reflecting optic (typically fused silica) or by absorbing the visible and infrared energy and transferring the absorbed heat to the reflecting optic (typically aluminum).