... battery capacity and lifespan.brandYOUGUOLight source3W-5W,Epistar LED chip made in Taiwan,single luminous flux> ... temperature2800K-3200K/6000K-7000K,LED decay <10% within 30000hoursControllerhigh efficiency,high-precision constant LED driver,static power < 4mA. ... Automatically identify the intensity of illumination, intelligent control LED light ON/OFF ...