Hella 165mm Free Form Hi-Lo H4 Conversion Headlamp, DOT and ECE. Including bulb. HL21100, 008888101 SKU: HL21100

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Hella HL21100 165mm Free Form Hi-Lo H4 Conversion Headlamp. Including bulb, 008888101

Sealed beam headlamps were introduced in the 1930s to provide a consistent quality of headlamps. Prior to that, headlamp design was left up to the vehicle manufacturer and lighting ability varied greatly.

The problem with sealed beams is that the lens, reflector and fillaments are all part of a bonded assembly. When the filament burns out, the entire lamp is discarded. Consequently, the sealed beam has become a commodity. As long as it meets the DOT standard, the only thing that matters is low cost. The DOT standard allows for a very loose pattern with a wide transition from dark to light. Many sealed beams still conform to the antiquated pre 2000 DOT standard that required 20% of the light go up to illuminate overhead signs.

All of this results in lamps that dazzle oncoming traffic and at the same time supply poor illumination of the road. The sharp low beam cutoff of Hella ECE lamps makes the areas that are supposed to be dark darker and the lighted areas to be brighter. We say that our lamps are four times brighter on low beam and twice as bright on high beam. Refer to the Isolux drawings at left.

Features:

• Low beam transition from dark to light in less than an inch, at 25 feet.
• Optical Quartz Clear Lens.
• Silverized Free-Form ABS Reflector.
• Replaceable H4 twin fillament bulb allows use of modern high performance bulb technology.
• Direct replacement for 4652, H4656, H4666 H4668, H6545, H6545BL, and HP6545 Sealed Beams
• Tight Pattern allows optical aiming.
• Hella Part Number 008888101

Includes:

• One 165mm Free Form Hi-Lo H4 DOT/ECE Conversion Headlamp-HL21100
• One 12V 60/55W H4 Original Equipment quality Bulb.-HL78151
• One Rubber Dust Boots.
• You may also need a wiring adapter. You will find that at the bottom of this page under related products.

165mm H4 Headlamp Wiring Instructions

Don't know what type of lamp your car uses?
Use this handy link to look it up.
Osram-Guide

There is no high beam only version of this lamp. It can be used as a high beam only lamp by not wiring the low beam filament. We do not recommend wiring the lamp so you have four low beams as this will result in oncoming traffic thinking you have your high beams on and they will flash you.