Back صمام ضوئي Arabic Фотолампа Bulgarian Fototub Catalan Fotočlánek Czech Photozelle German Fotoĉelo Esperanto Fototubo Spanish Cellule photoélectrique French Fotocella Hungarian Ֆոտոխողովակ Armenian
A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from photovoltaic or photoconductive cells. Phototubes were previously more widely used but are now replaced in many applications by solid state photodetectors. The photomultiplier tube is one of the most sensitive light detectors, and is still widely used in physics research.