TruOpto 3mm White LEDs High Luminous Intensity – TruOpto OSW4DK3131C-ST, A white 3mm LED that features high luminous intensity and long lifetime operation. Suitable for a wide range of applications including: electronic sign and signals, small area illumination, back lighting and other lighting. TruOpto OSW4DK3131C-ST LED 3mm White 30° 10000mcd