Why cant some dcor bulbs be burned base up?
When a dcor light bulb is burned base up, the heat from the filament rises into the base. For medium based dcor light bulbs this will cause the glue holding the base and the glass together to lose its adhesive. Some manufacturers offer a medium base and a candelabra base fan light which can be burned base up. These fan light bulbs are manufactured with a more costly cement in the base, which can withstand higher temperatures and not lose their adhesive. See light bulb manufacturers package for operating position.
