Product Specifications

ITEM	VOLTAGE	WATTAGE	BASE	CERT
H18	12V	65W	PY26d-1

I. Origin & Extreme Performance Positioning
   The H18 (PY26d-1) represents the peak of luminous output in automotive halogen technology, engineered for elite performance or specialized vehicles operating in severe weather. It was primarily fitted to select high-end European luxury cars, sports cars, and premium SUVs in the early 2000s (e.g., specific Porsche, Mercedes-AMG, BMW M, and Land Rover models). Its design prioritizes extreme wattage over efficiency or compactness, delivering auxiliary beams with exceptional penetration and breadth—effectively a "searchlight-grade" fog lamp.

II. Core Advantages: Unmatched Brightness & Penetration

1. Extreme Luminous Output: Rated at 70W or higher, it far exceeds standard 55W fog lights, generating immense luminous flux to dramatically improve visibility in dense fog, heavy rain, or off-road darkness.

2. Reinforced for Harsh Environments: Constructed with high-heat and high-vibration resilience for stable, reliable operation under极限 loads.

3. Professional-Grade Beam Pattern: Typically paired with complex lenses or deep parabolic reflectors to create a broad, uniform light field that minimizes side-front blind spots, rather than a focused hotspot.

III. Product Features & Key Identification

• Unique High-Wattage Base: PY26d-1: The definitive identifier. A large, single-tab ("d") bayonet base with a distinctive "Y"-shaped tab and larger diameter. It is physically incompatible with mainstream fog light types (H8, H11, H16).

• Oversized Envelope: A larger, more robust glass envelope accommodates the high-wattage filament and manages heat.

• Vehicle-Specific & High-Current: The vehicle's original wiring, fuses, and relays are designed specifically for this high load. Installation in non-designated vehicles risks overheating and fire.

Important Notes & Selection Guide

• Extreme Specificity: Only for vehicles originally factory-equipped with H18 fog lights. Not a universal upgrade.

• Strict Prohibition: Never install in non-original applications. Never substitute with other bulb types (e.g., H11).