Abstract
High color rendering index (CRI) has been obtained from mercury-free ICP’s lamp. Due to the strong demand on the development of mercury-free light sources, the authors investigated xenon and CO as an alternative element. These rare (Xe) and molecule (CO) gases have been used as a substitute for mercury as the environmental problems related necessitate the development of new type of light sources. The target of this study is to develop a new type of mercury-free lamp without using a phosphor where the authors concentrate on how to obtain a strong visible light instead of UV. In this paper, the colors, luminance and emission characteristics of these types of mercury-free ICP’s lamp is discussed. Without the use of phosphor, the authors obtained a good color rendering from xenon and CO ICP’s lamp where their CRI’s above 90. A strong continuum emission in visible region is obtained where luminance are ranged from 2000 to 25000 cd/m2 at 100 W of input power. Spectral distribution shows the continuum emissions are similar to the daylight distribution and chromaticity diagrams shows they are close to white region in color coordinates and color temperatures bringing a high index of the lamp’s color rendering.
