Some GM cars in the '50's and '60's came with these huge underhood lights. Sometimes they were mounted in the trunk. They were removable and held in place with a clip. There was a cord winder on them (explains the large size) and IIRC, there was a magnet on the back so you could stick it to the fender when you change a flat.
The glass lens was kind of conical shaped; the upper half was red colored, the bottom half was clear, IIRC.
My friend had a '70 Toyota Corona that had a miniature drop light that you plugged into a recepticle in the glove box.
My IROC has an underhood light. In an attempt to get brighter light, I replaced the #93 bulb with a #1156. Yes, it was much brighter, but the bulb burned so hot that the inside of the bulb became cloudy and quickly burned out after an hour or so.