A SMART CONNECTED LIGHT BULB

Multi-coloured LEDs are growing in popularity, because they are following the major trends in the lighting industry, in which there is strong demand for lighting equipment that is getting smaller, smarter and more colourful. RGB LEDs lighting fixtures offer endless colour changing possibilities [2]. Individual LEDs have different operating characteristics and hence contribute to variety of colours in the light output. By suitable control of RGB LEDs, it is possible to obtain distinctive colours and different white colours also possible. Keeping this objective in view, the project proposes to switch the LEDs in an optimal way, ensuring the best efficiency possible. These RGB LEDs are independently controlled and various modes of operation have been identified. In this regard the project also demonstrates the control logics and the optimal range of operation for RGB LEDs. As is well known, the three standard colours, red, green, and blue, can be mixed together to generate white light. With currently available LEDs, the generation of white-light can have luminous efficacies of around 30 lm/W (lumens/Watt.). Combining the spectra from three LED chips (or more) is expected to provide good colour rendering that can be used for general lighting. White light generated by phosphor- based LEDs can also have good colour rendering because the phosphors generally produce broadband radiation. A drawback is the limitation of available phosphors, which pose difficulty to control the colour and colour rendering characteristics.