We have a bunch of Feit Electric dimmable Performance LED® 12V MR16 bulbs with GU5.3 Bi-Pin bases for track and landscape lighting, and you’d serve yourself well to pick up a few. Measure 1-3/4” tall x 2" dia with a 1-1/2” dia face. Both have a 3000K color temperature (soft white) and 30,000 hours of life, according to the package. You pick: the 35W equivalent with 325 lumens, using only 7W; or the 50W equivalent with 500 lumens, using only 7.5W.