originally posted in:The Friends List
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Light bulbs don't really have an upside... Can they be upside down?
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Well, it depends on your view of a regular orientation of said lightbulb. For instance, most lamps have them threading down, but a lot of sockets have them threading up. I have a flexible lamp that had threading both up and down. The double socket in my room is sideways! And the orientation of the print on the bulb depends on the manufacturer.