Patent ID: 6291936
Filing Date: 2001-09-18
Classification: H01J

Abstract:
A discharge lamp, comprising:an envelope;a fill which emits light when excited disposed in the envelope, the fill being capable of absorbing light and re-emitting the absorbed light, the light emitted from the fill having a first spectral power distribution in the absence of reflection of light back into the fill;a reflector disposed around the envelope and defining an opening, the reflector being configured to reflect some of the light emitted by the fill back into the fill while allowing some light to exit through the opening, the exiting light having a second spectral power distribution different from the first spectral power distribution;a source of excitation power coupled to the fill to excite the fill and cause the fill to emit light: andan optical element spaced from the envelope and configured to reflect an unwanted component of light which exited the envelope back into the envelope through the opening in the reflector.