Are they the small screw-in type, as used in very old LGB locos? If so, they should be available as spares from most good LGB stockists (eg: GRS, Chalk, P&S, and Glendale while they are still open), or from various overseas spares suppliers like Modell-Land or Champex Linden.
Garlic bulbs would be more useful. True they would show no light, but, who in his right mind plays around outside at night, when being inside, away from night bugs, skunks, racoons, and chill, is much more desirable.
Well, the OP hasn't been back on to say whether our assumptions (such as my comments in post no.2) about what he wanted are correct, or to give us some more information on what he needs - so we've just kind of been left to our own devices - and you know where that can lead....
In reality; it is wonderful to find a serious thread, that actually provides an answer or three to a member's question, and is not afraid to include some good humour… Thank you everyone, for helping to keep humour in our wonderful hobby, and interest group. Fred Mills