Ambient Temperature Effects in the Photometry of Fluorescent Lamps

The dependence of the luminous and electrical characteristics of fluorescent lamps on the ambient temperature introduces complications in the photometry of these lamps. It is shown that if both the luminous flux and the electrical characteristics of a stable lamp are measured over a range of ambient temperatures, then on future occasions of burning within that range it is possible to deduce the luminous flux of the lamp from measurements of its electrical characteristics without requiring a knowledge of lamp or ambient air temperature.