A panoramic light emitter of an omnidirectional horizontal light beam with very sharp cut-off in the vertical plane is disclosed. The sharp cut-off prevents interference near airports. High average powers are attainable because the light source can be distributed rather than be a point source. The omnidirectional-in-the-horizontal-plane...http://www.google.fr/patents/US4593345?utm_source=gb-gplus-shareBrevet US4593345 - Panoramic optical system with very sharp beam control
Panoramic optical system with very sharp beam control
