Patent ID: 8919977

Claim:
A lamp comprising a phosphor, a radiation source arranged to irradiate the phosphor with optical radiation that is at least partly in the visible spectrum for exciting the phosphor to produce visible light, an optical system arranged to concentrate the light produced by the phosphor, and a heatsink thermally connected to the phosphor and arranged to dissipate heat produced by the phosphor; in which the phosphor is mounted on a plane reflector being at least one of disposed on the heatsink and a reflective surface of the heat sink, and facing a curved reflector and the radiation source; the lamp further comprising at least one filter layer that is transparent to the optical radiation but reflects visible light emitted by the phosphor, wherein the filter layer is disposed between the phosphor and the optical radiation source; and a heat-conductive member positioned after the optical radiation source and before the phosphor in the path of the optical radiation, wherein the heatsink is in thermal communication with the heat-conductive member that is transparent to the optical radiation, and the optical radiation passes through the heat-conductive member before reaching the phosphor.