10-PK SYLVANIA 3893 Basic Miniature Bulb. The SYLVANIA 3893 is a basic, long-life miniature incandescent bulb primarily designed for automotive applications.
Common Applications:
Automotive Interior Lighting: Frequently used for dome lights, map lights, glove box lights, and trunk lights.  
Automotive Exterior Lighting: Can be found in backup/reverse lights, side marker lights, and sometimes license plate lights.  
Other Auxiliary Lighting: Suitable for various other indicator and small lighting needs in vehicles.  

Key Specifications:
Voltage: 12V (Volts)  
Wattage: 4W (Watts)  
Current: Approximately 0.33A (Amps)
Brightness: 35 lumens
Base Type: BA9s (a small bayonet base with a single contact)  
Bulb Shape: T2 (a small, tubular shape)
Filament Type: Typically C-2F
Light Color: Clear, producing a warm white light (around 2800K color temperature).  
Average Life: Approximately 1200 hours. Sylvania markets this as a "Long Life" bulb, implying it lasts longer than their standard miniature bulbs.  
Dimmable: Yes, being an incandescent bulb.