ahhh so that rules out just about every fixture in my house lol. The only base down fixtures in my house are the chandelier over the stairs and the four outdoor lights. The bedrooms have 45 degree base up lamps, the kitchen and dinging room use base up lamps, and the hallway, bathrooms, and basement use horizontal lamps.
How come signal lamps can't be used base up? Is the filament too close to the base or something?