Abstract: An arc lamp includes a housing; an inert gas in the housing; a pair of spaced electrodes in the housing for establishing an arc in the gas to generate a radiation output; a window in the housing for transmitting forward radiation generated by the arc; and a spherical reflector on the opposite side of the electrodes from the window and having its center disposed in the arc for redirecting rearward radiation through the center to add to the forward radiation transmitted through the window.

Abstract: An arc lamp with a housing including a base, an inert gas in the housing, a pair of spaced electrodes in the housing for establishing an arc in the gas to generate a radiation output, a window area on the housing for transmitting forward radiation generated by the arc, and an absorbing medium on the opposite side of the electrodes from the window for preventing backscatter radiation from the arc from passing through the arc and out of the window.

Abstract: A light beacon for marking tall obstructions which may present a navigational hazard to air traffic comprises a transparent cover and a plurality of linear light sources, each having a central axis. The linear light sources are positioned within the transparent cover in a substantially horizontal orientation relative to a reference plane which will typically be parallel to the horizon. The plurality of reflectors corresponding to the plurality of linear light sources are positioned behind respective ones of the light sources. Each of the reflectors has an optically reflective surface and is configured as a partial cylinder having a parabolic or pseudo-parabolic cross-section. The reflective surface having the parabolic or pseudo-parabolic cross-section defines an optical center comprised of a focal line. The linear light source is disposed with its central axis being substantially coincident with the focal line or optical center of the respective reflectors.