Koito 4570A PY21W Amber Turn Signal Bulb 12V 21W BAU15s Base

The Koito 4570A is a premium incandescent automotive turn signal bulb designed for reliable performance in front and rear turn signal applications. This genuine OEM-quality replacement bulb features amber-colored glass for proper signal visibility and complies with automotive lighting standards.

Key Specifications:

• Bulb Type: PY21W (also cross-referenced as 7507, 1141, BAU15s)
• Voltage: 12V DC
• Power: 21W
• Base Type: BAU15s single contact bayonet
• Light Color: Amber
• Glass Bulb: S25 size
• Luminous Output: Approximately 280 lumens
• Average Rated Life: 500 hours
• Bulb Dimensions: Approximately 46mm length x 25mm diameter

Applications:

This bulb is commonly used in turn signal lamp assemblies for various automotive applications. The BAU15s offset pin base ensures proper installation and prevents incorrect fitment. The amber-tinted glass provides the appropriate color temperature for turn signal visibility without requiring an amber lens.

About Koito:

Koito is a leading Japanese manufacturer of automotive lighting products, known for supplying OEM lighting components to major automakers worldwide. Their bulbs meet strict quality standards for brightness, longevity, and electrical specifications.