Abstract: These days, the LEDs used for residential, commercial and industrial sectors puposes could be configured for lively with specific lighting, which provides more efficient outcome. The basic idea is to drive the bi-color stripe (warm white stripe with cool white stripe of LEDs) for precise PWM dimming in the range of 1-10V. The dimming of LED strings is controlled by using the android phone. The most important thing that needs to be taken in consideration for controlling the light level in an energetic way, preserving the desired light level where needed while controlling light to a minimum value. However, the regulation of light intensity (brightness) and colour correlated temperature is obtained by adjusting the PWM dimming for LEDs. PWM signal enables us to attain minimum intensity levels and more linear control of light intensity compared to continuous current dimming methods. Though, accurate LEDs controlling of colors which possess color point maintenance, light intensity control along with color mixing in due with LED device lifespan and changes in temperature at a junction. Smart with efficient lighting evolves from the traditional lighting control system with feedback from integrated sensors. In order to achieve the goal of accurate color mixing of two LED strings (warm and cool white LEDs), the closed loop non-linear feedback control method is adopted instead of a linear control method.
Keywords: Bi-color LED stripe; PWM dimming; Color correlated temperature (CCT); luminance; color mixing; 0-10v range; non linear feedback control; lighting levels.