Originally Posted by Jean
The outside light on my 13 has a teeny, 'automotive' bulb ...
Originally Posted by Bobnjudy
If you go to Little House Customs dot com store they sell a replacement yellow lens for Bargeman lights.
I was wondering if Jean has an oddball lamp using a small bulb, but if it really is the ubiquitous Barman #78
, it probably uses an 1156 or 1141 bulb - I have four of these lamps on two RVs and they all use those bulbs. These two types have identical bases (BA15s, which is a 15 mm diameter single-contact bayonet) so they are interchangeable; however, the 1156 is much higher power (about 28 watts versus 18 watts for the 1141). RVs usually use the 1141 for both interior and exterior applications, and one needs to be cautious about putting in the 1156 because some lamps can't handle the extra heat (you can melt the plastic).
That's not small - that's one of the largest automotive bulbs you can get. They are very common in "yellow" (actually amber), because many vehicles have used this style of bulb in front (and some rear) turn signals with a clear lens, so the bulb has to be yellow. The common amber bulb of this size would be the 1156NA ("NA" means "natural amber" in auto bulbs), so that's what you would look for in an auto parts store.
These are available in LED, which solves the heat problem - LEDs still produce heat, but much less. For example, at SuperBrightLEDs:
1156 LED Bulb - 27 SMD LED Tower - BA15S Retrofit - Amber
If I don't have the right lamp, and it really has some other "teeny" bulb, of course all of this 1141/1156 stuff doesn't apply.