Diadem P21W. BAU15s 12V The design light with opal look OSRAM DIADEM signal lights only emit amber or red light during operation – making them the perfect, attractive light supplement for halogen and xenon headlamps. Thanks to the state-of-the-art interference coating, the lamp shines in an opal look and is suited to all indicator lights with clear covers. In addition, it convinces with up to double the service life compared to standard lamps. Specifications: Double life compared with traditional Flash lamps. Suited to all clear glass main. Optical tuning of older vehicles.