Development and prototyping of a HB-LED array module for indoor solid state lighting

Light emitting diodes (LEDs) have been widely used for a long period of time in various applications such as instrumentation signals, message displays, traffic signals, decoration and personal lighting. With the increase in power rating and the improvement in optical efficiency, LEDs have demonstrated high potential for general lighting applications. In recent years, people became interested in using high brightness LEDs (HB-LEDs) as light sources to replace conventional fluorescent light tubes and lamps. Industrial forecasting indicated that the luminous efficiency of HB-LEDs will be greatly improved in the near future. In addition to increasing luminous efficiency, HB-LEDs have other advantages such as ultra long life, relatively low power consumption, and no UV radiation. These superior properties give HB-LEDs an extra edge over conventional lighting sources. In this study, the coating process for generating white light from blue LEDs was investigated. Furthermore, a prototype of HB-LED array module was fabricated to demonstrate the feasibility of such a lighting device. The outcome of the present study shows that HB-LED array modules should have good potential to replace conventional fluorescent light tubes for indoor solid state lighting (SSL)