A light source that prevents broken pieces from dispersing to the outside without increasing the number of components while efficiently cooling a light-emitting tube is provided. The light source (10) has: a light-emitting tube (11) having a light-emitting portion (111) where light beam is emitted by electric discharge between electrodes and a sealing portion (112) provided on both sides of the light-emitting portion (111); a reflector (12) that reflects the light beam emitted by the light-emitting tube (11) forward after aligning in a predetermined direction; a cover (16) covering a light-irradiation opening of the reflector (12) and having an opening for irradiating the light beam reflected by the reflector (12), the cover having a heat-radiation fin (162) on the outside thereof and being made of a heat-conductive material to absorb the heat from the light-emitting tube (11), the absorbed heat being conducted to the heat-radiation fin (162); and a transparent member (14) that covers the opening of the cover (16).
A light source device, includes: a light source lamp that has a light emitting tube and a pair of electrodes, the light emitting tube including a discharge space; the pair of electrodes being disposed in the discharge space of the light emitting tube; a reflector in a substantially C-shape in cross section that reflects a light beam irradiated from the light source lamp; and an unused-light reflecting member being disposed on a light irradiation front side of the reflector and including an unused-light reflecting surface, the unused-light reflecting surface reflecting unused light irradiated outside the reflector of the light beam irradiated from the light source lamp, the unused-light reflecting surface being an ellipsoidal surface that has a first focal position on a light emission center of the light source lamp and a second focal position onto which the ellipsoidal surface reflects and converges the unused light to be guided to the outside of the light source device.
A nose cone for a projector lamp having a lamp burner and a reflector, includes a metal shell, having a rear edge configured to attach to a forward edge of the reflector, and configured to cooperate with the reflector to substantially enclose the lamp burner. The metal shell includes means for dissipating heat therefrom.
