An S11 bulb is a small, rounded incandescent or LED bulb that’s widely used in applications needing reliable, low- to moderate-level lighting, particularly for decorative and indicator purposes.

Key Characteristics:

• Shape and Size: The "S" stands for "Sign" bulb, and "11" denotes its diameter, making it 11/8 inches or 1.375 inches (35 mm) wide.
• Applications: S11 bulbs are frequently used in marquee lights, signage, appliances, displays, and accent lighting. They are common in vintage-style string lights, casino lights, and illuminated signs.
• Voltage and Base Options: Available in various voltages, including 12V, 24V, and 120V, and with different base types such as E26 (medium) and intermediate bases.
• Light Output: These bulbs produce a moderate amount of light, with incandescent options providing a warm, soft glow and LED variants offering multiple color temperatures and improved energy efficiency.

S11 light bulbs are durable and visually appealing, making them a popular choice for decorative and specialty lighting applications.