Development of white LED down light for indoor lighting

Abstract

The rapid improvement in LED technology with relatively low power consumption and long lifetime, provides greater potential for general lighting applications ranging from traffic signal, signboard, message displays, instrumentation signals, cars lamp and others. The exponential growth of LED lighting resulted in a vast selection of integrated circuit devices to provide controlled white LEDs. No longer acceptable to an energy-conscious world, switched-mode LED drivers have long since replaced power-hungry linear current sources as the standard. In many instances, real-time changes in LED output intensity are required and commonly referred to as dimming control. The driver can automatically switch to Pulse Width Modulation (PWM) according to dimming input signals. The study presents the potential of LED for indoor applications and demonstrates a white LED lamp module to replace the compact fluorescent lamp (CFL) and to reduce the energy consumption. Furthermore, a prototype of LED lamp module was fabricated to demonstrate the feasibility of such a lighting device, where the LED lamp module is compared to (CFL). Several techniques are used to provide dimming control to switched-mode WLED drivers. Experimental results are presented here to verify the performance of the driver connected to white LED lamp module. From the outcome of this study, the white LED driver circuit lamp module is much more efficient and has a great potential for indoor application.