Abstract: This invention relates to UV dryers and provides an ultraviolet dryer wherein a UV lamp (2) is supported in a reflector housing (1), said housing including a reflector body member (10) having a reflective surface adjacent the lamp (2) and other surfaces spaced therefrom and cooling means (11) for passing a cooling medium over said other surfaces to cool said body member, wherein the reflective surface comprises a thin, flexible strip of heat-conductive sheet material (12) bearing dichroic film, said film exhibiting a high degree of transmission towards infrared radiation and high degreee of reflection toward UV radiation.