those are most definetly sign light bulbs, but many times municipalities would also use them for christmas lighting. In fact, the town of Moltrie GA still has a wonderful display with the town square festooned with these lightbulbs at christmas. I just bought four of them at a yard sale for 15 cents and have used them as an oversized string of lights for christmas before. The bulbs I got are from westinghouse and yellow/orange in color, rated 11w at 130 volt and are indicated as for use in signs