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Did you know that for the 42 years between 1941 and 1983, sealed beam headlights were required on ALL vehicles in the United States? Totally crazy right? To make matters worse, there were only FOUR styles of them allowed! Just imagine what modern cars and trucks would look like if they all shared the same headlights! Not cool! That being said, before 1984, headlamps were super easy to replace with simply a Phillips screwdriver, they were inexpensive to buy, and easily found in every single auto part store in America. These days, for the sake of fantastic styling and improved visibility, lighting up the darkness has become a bit more complex. "Headlights" don't even have one standard name! They can be called "headlights" (without the space) "head lights" (two words), headlamps, or head lamps! Then there is the whole halogen, xenon, and HID nonsense as well. Let's try to make sense of it all.
Sealed Beam Headlights
Sealed beam headlights are one piece designs with glass lenses. The bulb, the lens, and the housing are all connected, and cannot be separated without destroying the light itself. If the bulb burns out, the whole headlamp needed to be replaced. There were only two sizes of sealed beam lights available between 1940 and 1978, which were the round 5.75 inch and 7 inch style. To make vehicles look good when they all used the exact same lighting, many manufacturers had headlamp covers. The Camaro RS/SS and Buick Riviera are two great examples of this. By 1978, rectangle headlights were finally permitted, and many car manufacturers rejoiced. The really big win though, was in 1983. It was then that the Federal Motor Vehicle Safety team fully removed the entire sealed beam rule, and allowed plastic lenses and replaceable light bulbs! This meant that car and truck manufacturers could finally design the headlights to "flow" with the styling of the vehicle itself, and not hide them behind plastic covers. It was a very big deal at the time.
Composite lights were the kind of headlight that came right after the sealed beam. They have replaceable bulbs, which are filled with halogen gas. For this reason, many people call these lights "halogen headlights". The vast majority of them have plastic lenses, though there are a few exceptions here and there (I'm looking at you Volvo). Composite headlights also have the ability to incorporate turn signals, and even fog lamps into their design. This really gives the car and truck designers a blank canvas to work with, and makes for great looking vehicles. The downfall of this type of headlight is that the plastic lenses all eventually either turn yellow or fall off completely. Both are quite embarrassing, and won't get you a passing inspection sticker... unless of course you "know a guy", wink wink. When it comes to yellow or sandblasted headlight lenses, some people like to try the magic headlight cleaners. That's because well - some of them do actually work. The problem is that none (that we have encountered) will last for more than a couple months at the very most. That really stinks if you actually want to see the road at night, like most drivers do.
HID / Xenon Headlights
HID is an acronym for High Intensity Discharge. The HID bulbs contain Xenon gas. This is why these two terms have become interchangeable over the last several years. They are the same kind of headlight. Way back in 1991, the European spec BMW 7-series was the first factory vehicle to come with HID's, and they were a game changer. The HID bulbs lasted two to three times longer than the halogen bulbs, they draw less power, they are brighter, and they look absolutely fantastic. The HID headlight system is slightly more complicated than a halogen headlamp because HID's require a "ballast" to control the power flow to the bulb itself. The downfall of these is price. Replacing a factory HID headlight can be twice the price of the halogen version, and they are not interchangeable without modifications. There are also more areas for failure because there are more components than in a non-HID headlight. These types of headlights are also blinding to oncoming traffic if not aimed properly, which would obviously attract unpleasant hand gestures as well.
Halogen and HID versions of projector headlights both exist in the wild, depending on the vehicle. This style of headlamp has a metal shield in front of the headlight bulb that actually helps focus the light in a specific direction with the help of a special lens inside the headlight housing. The metal light shield actually moves down to allow the full light from the bulb when the high beam switch is activated. As you can imagine, these lights are high end, and their price reflects it. Also, with additional moving parts, there is more opportunity for things to go wrong.
Quad Vs. Non Quad Headlights
One of the more common questions about headlights that we receive is "what is the difference between quad and non-quad headlights?". Luckily, it sounds far more confusing than it really is. The "quad" headlights have two headlight bulbs per headlight. The "non-quad" headlights have just one headlight bulb per headlight. If your vehicle came with quad headlights, your only option is quad style replacement headlights if you need to change them. The same goes for non-quad headlights. The two styles are not interchangeable because the headlight wiring on the vehicle will not match up to the opposite style.
If by chance, some masked bandit took off with both of your headlights, and you are only left with the wiring to figure out if you have quad or non-quad headlights, there is still hope in figuring out which you had! The quad headlights have two headlight bulbs each, one for the low beam and one high beam bulb. The quad-style headlights will have two headlight bulb connectors each, and each connector will have two wires going to it. The non-quad headlights only have one headlight bulb which is the high beam and low beam. That means that there will be just one headlight bulb connector, with three wires going into it.
As you can see, headlights are where 1A Auto's passion really shines (I love puns!). We have brought the simplicity back into headlight replacement, as if it were 1970 all over again. We have thousands of installation videos for guidance, we have competitive prices, and thousands of replacement headlights in stock at all times across the country. You can browse our large selection of replacement headlamps and shop right here on 1AAuto.com or, if you have any questions about our products, warranty, compatibility, or simply prefer to order via phone, you can call our customer service toll free at 888-844-3393.
Written By: Jeremy Nutt