(R-794-3v, R-794-9v, R-794-12v) Super Small LED Bulb – $2.25 each
This is a smaller LED bulb than the 1.8 mm bulb. However in my experience it does not seem as bright as the other bulbs. The wires come straight out from the sides rather than down from the bulb itself. However, they may be bent to a 90 degree angle. The bulb may be wired for 3 volt DC, 9 volt DC or 12 volt AC/DC. It is available only in cool white or red. (Evan Design)
Because it is small, it is great for ceiling installations in the smaller scales and the illumination is in scale with the tiny scales.