What is the description name ( i.e. T-1, etc) for a miniature bulb of this
type:

screw in type
base diameter of 3/8"
base heighth of   1/2"
overall lentgth of 1"

Also, if anyone has a good contact for bulbs, I am looking for a
preferrably 10, but as low as 5 watt bulb for 4.8 or 14.4V DC.

Thanks.