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Thumbnail Filmstrip of Hella 165mm Free Form Hi/Lo H4 Conversion Headlamp, DOT and ECE. Including bulb Images
Fleet Buyers Contact Us for Volume Discounts 610-944-3233
A little history:
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.
THESE LAMPS USE H4/9003/HB2 BULBS, CLICK
THIS LINK FOR YOUR ALTERNATIVES
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 H4652, H4656, H4666 H4668, H6545, H6545BL, and HP6545 Sealed Beams
- Tight Pattern allows optical aiming.
- Hella p/n 008888101
- SMS p/n HL21100
SPECIFICATIONS:
- Width: 165 mm / 6 inch
- Height: 103 mm / 4 inch
- Depth: 107 mm / 4 inch
- Meets SAE/DOT standard.
- High'Low Beam
- Uses any H4/9003/HB2 bulb.
- Bulb Base: P43t
- Hella P/N: 003177821
- SMS P/N: HL21100
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.
The wiring adapter:
- The pin-out of 165mm lamps is different that other sealed beam lamps. See the chart above.
- To make this conversion simple we include our P/N HL66490, Hella P/N 003385001 which will make it plug and play.
- Some cars, mostly the ones with only two headlamps, require the H6545, 4666 or 4668 lamp. These lamps had the ground lug on an angle. I assume this was to insure you install a high/low beam lamp. At one time we could get the adapters with the angled ground, but no more. You will have to release the male connectors from their holder and insert them into the the stock connector, IN THE PROPER ORDER. The chart above will show you the proper pinout.
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.
OPTICALLY AIMING ECE HEADLAMPS
ECE headlamps are intended to be aimed optically. This is a superior method to aim headlamps because it eliminates the effects of manufacturing tolerances and variations in filament placement in respect to the aiming lugs. Consequently, ECE headlamps do not have any aiming lugs.
Many auto repair businesses have equipment to aim headlamps optically, but not all. The advantage of this equipment is that aiming can be done indoors with the lights on and uses considerably less floor space.
To aim these headlamps yourself is relatively simple. Here are the steps.
- Adjustment of these headlamps is achieved by turning the two screws on the headlamp frame. The screw at the top or bottom will adjust the up-down aim, and the screw at the side of the lamp will adjust the left-right aim.
- This is best done at night.
- Position your car on a level surface. Pointing at a garage door or a wall, place the vehicle about 25 feet from the wall.
- Turn the headlights on low beam.
- Using a yard stick or a tape measure, as close as possible to the left side head lamp, measure the distance from the floor to the cutoff line of the lamp beam. Note this distance.
- Looking at the light pattern on the wall, adjust the left-side headlamp left or right so that the “Hot Spot: is in line with the headlamp. Try to get it correct within a couple of inches.
- Go to the wall and mark the height of the headlamp and then measure down three (3) inches and mark it with tape, or if you own the wall, a marker.
- Adjust the headlamp so that the cutoff line is at the lower mark. 3” of drop in 25 feet.
- Measure the distance between the headlamps. Note this number.
- On the wall, measure to the right the distance between the headlamps and mark the wall.
- Looking at the light pattern on the wall, adjust the right-side headlamp left or right so that the center of the “Hot Spot: is at the mark. Try to get it correct within a couple of inches. This should result in the beams of both headlamps being parallel to the longitudinal axis of the vehicle and to each other.
- Using the same height measurement you used for the left-side headlamp, adjust the right-side headlamp up or down so that it is the same height as the left-side headlamp.
