Suitable for use during blackouts, a new lamp demonstrated by engineers of the General Electric Company, Schenectady, N. Y gives off invisible rays which will help motorists and pedestrians read road; signs, but will not help enemy planes. The lighting unit is a 3-watt Argon (gaseous) lamp which also emits faint visible light of about one candlepower, compared with 4,000 from a modern street light. To prevent detection of stray rays by aviators, the lamp is designed like an admiral’s hat. The invisible light, consisting of ultraviolet rays, becomes visible when it strikes fluorescent paints. By using such paints on road signs and illuminating them with the invisible rays, they could be seen by auto drivers, but not from a plane.