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The OSRAM 7528 21/5W 12V lamp is a twin-filament automotive lamp with BAY15d bayonet base with offset pins. The main 21W filament emits 440lm, while the secondary 5W filament provides the reduced light.
It fits the rear lights of cars, motorcycles and trailers with a 12V system, where the 21W filament acts as the stop light and the 5W filament as the position light. It is also used in some indicators and daytime running lights of the same type.
It fits into the BAY15d lampholder by pushing and twisting: the offset pins allow only one mounting direction, so the two filaments stay correctly connected. Use it only on 12V systems. It replaces 21/5W 12V lamps with BAY15d base from other brands. It is best to replace the lamps of both lights in pairs.
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