What type of LED 'Eveready' using for 'digiLED' technology to give focused bright white beam of light with high intensity ? digiLEDs are entirely different from normal LEDs that we used to see in all PCBs and electronic-electrical devices. Does it contains any 'optical lens' to give such a highly power efficient light than incandescent bulbs or normal LEDs(indium gallium arsenide phosphide,indium gallium nitride). ? The same LEDs used as marker lights in Indian railway. At the top of these LEDs there is one white spot, through which light coming out.