BA15D / BA15S / BAY15D Lamp Base & Holder – 1156 & 1157 Compatible Upgrade your DIY lighting project with this versatile, high-quality lamp base and holder compatible with BA15D, BA15S, BAY15D, 1156, and 1157 bulb types. Whether you're wiring a marine vessel, a custom automotive fixture, or a home DIY lighting setup, this nickel-plated iron lamp holder delivers reliable electrical contact and a secure bulb fit every time. Key Features Universal Compatibility: Fits BA15D (double-contact bayonet), BA15S (single-contact bayonet), BAY15D, 1156, and 1157 lamp bases — perfect for a wide range of bulbs and applications. Durable Construction: Made from nickel-plated iron contacts with an ABS plastic base for corrosion resistance and long-lasting performance. Wide Voltage Range: Rated for 3–36V DC, making it suitable for automotive, marine, RV, and low-voltage DIY lighting systems. Current Rated: Supports up to 5A, handling most standard incandescent and LED bulb loads with ease. DIY-Friendly Design: Simple screw-terminal or solder connections make installation straightforward for hobbyists and professionals alike. Ship & Marine Use: Designed with boat and marine lighting in mind — ideal for navigation lights, cabin lights, and instrument panel lamps. High Quality: New, premium-grade components ensure stable contact and consistent performance. Specifications Base Type BA15D / BA15S / BAY15D / 1156 / 1157 Base Material ABS Plastic Contact Material Nickel-Plated Iron Rated Voltage 3–36V Rated Current 0–5A High-Concern Chemicals None Package Contents 1 × Lamp Base/Holder Country of Origin Made in China Notes Due to manual measurement, please allow a tolerance of 1–3mm. Colors may vary slightly from product images due to different monitor display settings. Learn More About Electrical Safety For guidance on safe DIY electrical practices and wiring standards, visit the U.S. Consumer Product Safety Commission – Electrical Safety resource center. Frequently Asked Questions Q: What is the difference between a BA15D and BA15S lamp base? A: The BA15S is a single-contact bayonet base with one pin at the bottom, while the BA15D is a double-contact bayonet base with two pins. This holder is compatible with both types, along with BAY15D, 1156, and 1157 variants, making it highly versatile for different wiring configurations. Q: Can I use this lamp holder for marine or boat lighting? A: Yes! This lamp holder is specifically designed with ship and marine applications in mind. Its wide voltage range (3–36V) and nickel-plated iron construction make it well-suited for marine navigation lights, cabin lights, and other onboard lighting fixtures. Q: What types of bulbs are compatible with this lamp holder? A: This holder is compatible with BA15D, BA15S, BAY15D, 1156, and 1157 bulb types — including both standard incandescent and LED equivalents within the rated voltage (3–36V) and current (up to 5A) specifications. Q: Is this lamp base suitable for automotive use? A: Absolutely. The 1156 and 1157 designations are common automotive bulb standards, and the 3–36V rating covers standard 12V vehicle electrical systems. It is suitable for tail lights, indicator lights, and instrument panel lighting on cars, trucks, and RVs.