I wanted a good old type handheld spotlight that I could put a 100W aircraft bulb in. It's hard, if not impossible, to find those any more, except for good ol' eBay. I got one (probably from the '60s) in the other day & it has a real funky cigarette lighter type of plug / adapter over a bayonet bulb type of plug, you know, like tail lights & the like use. I think I remember seeing in an old truck or Jeep a long time ago a socket in the dash that looked like a bayonet bulb socket & was labeled 'spotlight'. I started to change the plug to a regular accesory plug but then decided to leave it original, especially since I was trading the 30W bulb for a 100W bulb anyway. I scrounged around in my shop & found a socket that I'll mount either in or under the dash. Anyway, this got me to wondering, way back when, were handheld spotlights all equipped with this plug & were they fairly specific to this socket or what? If this was peculiar to handheld lights, why did they use this plug??? Any of you old timers know? Thanks.