The Delta One Universal Red Jumbo Safelight is a bulb type safelight, which is ideal for special applications that are sensitive to light.It finds use in dark room processing of standard black and white printing, litho-orthograhic, blue-sensitive, and graphic arts materials.The Jumbo 25 Watt Safelight features an Edison base screw mount that fits the female Edison socket predominant in most householdsThis safelight requires a voltage of 120 V