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I've used bulbtown.com.  The bayonet base bulb that fits is called a Ba9S.  The envelope, or bulb shape/diameter is G3-1/2.  Interestingly, I could not find an 18v version, most are 12 or 14.5.  There are a couple of 28v versions.  The 4.7 watt version should be bright enough at 18v.  The bulb is #356.

There is an 18v bulb but it is a G4-1/2 which is a little larger (1.06" vs 0.94").  I would be concerned about heat, working at max voltage, with a large bulb being too close to the lense cap.

These bulbs are less than $1.

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