Led current bias control using step down regulator is the title of the new patent that has been field by the catalyst semi conductor. the patent number 7,323,828 has been field for led related invention. The technology has been developed to simplify brightness in led lighting in many applications. The new patent insures a simpler smaller friendly and cost effective power efficient green leds. There is also a product which has in corporated this technology and it is cat 420 a driver optimized for driving high brightness 350 ma leds at up to 94 percent efficiency.