Development of Sub-Miniature Halogen Bulb without Exhaust Tube, Having High Color Rendition

Incandescent bulbs have been mostly used in the field of conventional light source for display and automotive lamp. However, recent increasing requirements for compact structure, color display, high display quality and improvement of total car design by means of color coordination, can only he satisfied with more natural color light sources. These requirements have led us to develop miniature halogen bulb without exhaust tube which was common in conventional halogen bulb. This new bulb gives compactness in its structure, high efficiency whiter light, and good luminous flux retaining characteristics. In this paper, we report the details of the developed bulb and its applications.