Additional information. They are approx 3/16" diameter, 1/2" tall (5mm x 12mm), with through pcb leads. Meter says they are somewhere around 12-13vdc.
The blue-green stuff is not a coating but a rubber like covering over the bulb attached at the white base.
Any suggestions for alternative lamps I could use are welcome. If I don't get some direction I'll probably cut one apart to see if the inner bulb is something more familiar.
Thanks.