Product Specifications

Overview:
The T19 P15D-25-1 is a single-filament halogen bulb primarily used in small vehicles, motorcycles, agricultural machinery, and some commercial vehicles. It is characterized by its relatively high wattage (typically 25W or higher) and the P15D-25-1, a special industrial-grade heavy-duty base, designed for signaling and lighting in high-vibration, high-load, or harsh environments.

Core Features and Specifications:

1. Model & Specifications

   • T19: This code refers to the shape and size of its glass envelope. "T" stands for "Tubular," and the number 19 indicates its maximum diameter is approximately 19/8 inches (about 2.375 inches or 60 mm). This is a relatively large bulb capable of handling higher wattage.

   • Rated Voltage & Wattage:

     • Operating Voltage is typically 12V.

     • A common wattage specification is 25W. Variants with higher wattage (e.g., 32W, 35W) may also exist, which should be confirmed on the physical bulb. It is designed for higher light output than miniature bulbs.

   • P15D-25-1 Base Details: This is a heavy-duty, industrial-grade, prefocused, single-contact bayonet base. The breakdown is as follows:

     • “P” stands for Prefocused (precise filament positioning).

     • “15” is the base diameter or series code.

     • “D” usually denotes Double Pin (referring to the two symmetrical or near-symmetrical locating pins for mechanical retention).

     • “-25-” is likely associated with its standard wattage (25 watts).

     • “-1” indicates it has One electrical contact (a center positive tip, with the metal shell as the common negative return).

2. Working Principle & Application

   • Working Principle: Standard single-filament halogen bulb operation.

   • Primary Applications: Due to its high reliability and vibration resistance, it is commonly used in demanding fields:

     • Turn signals or brake lights for heavy-duty motorcycles/ATVs (especially rear).

     • Warning lights, work lights, or turn signals for agricultural tractors and construction machinery.

     • Clearance lights, marker lights, or turn signals for commercial trucks and trailers.

     • Lighting and signaling for industrial equipment and special-purpose vehicles.

3. Key Distinctions & Compatibility

   • Vs. Common Miniature Bulbs: The T19's size and wattage (typically 25W+) are much larger than common bulbs like P21W (BA21d) or small marker lights, offering stronger light output and a more robust physical construction.

   • Vs. Other T-Type Bulbs: The T-series bulbs (e.g., T10, T15, T20) increase in size and wattage. The T19 is a medium-to-large specification.

   • Base Uniqueness: The P15D-25-1 is a highly specialized base designed for vibration resistance and reliable contact. It is physically incompatible with more common bases like P15d, P21W, or BA15 series. The pin spacing, diameter, or bayonet locking mechanism usually differ, preventing direct substitution.