Circuitron CIR750101 7501 Hyper-Brite(tm) White LED 3.0mm Diameter 12-16V Single LED All Scales

50 times brighter than general-purpose LEDs. 3mm diameter. For DC power. Includes limiting resistors for use with 12-16V supplies.
 
Special resin reduces bluish output and provides incandescent look. Great for use as headlights.