HELLA H4/9003/HB2 High Performance 2.0 Xenon Bulbs, Pair SKU: 179712161

Why so many numbers?

The H4 designation was assigned to the first Halogen dual filament bulb homologated by the ECE (European Union) in 1970. It is the most common bulb in use world wide. It has many variations in voltage, wattage, color and construction.The single over-riding criteria is that it will fit in a lamp designed to the H4 standard.

In 1983 Ford Motor Company applied to USDOT for a replaceable bulb lamp design to allow the use of aerodynamic headlamps. They designated use of an H4 bulb but with changes and the DOT designation 9003 was assigned. These changes involved voltage, Wattage and light color while maintaining the basic H4 design. There were some other changes made primarily in the area of construction tolerances. A 9003 is basically an H4 12 volt 60/55 watt bulb with a light color of about 3200ºK.

Even though the 9003 and the H4 are simular, they are not the same, so ECE applied a new designation of HB2 to the 9003 for cars exported to the US market.

Features:

• Complies with DOT, ECE and INMETRO when applicable
• OE Quality and built under stringent testing requirements
  
• Re-engineered filament for greater light output*
  
• Exclusive halogen gas formulation for improved performance*
  
• High quality quartz glass with a specialized blue coating
  
• Manufactured under strict HELLA guidelines
  
• An optimal balance of bulb performance and bulb life
  
• 1 year warranty
  *Versus HELLA standard bulbs.