When it comes to safe driving at night, upgrading the headlights in your car or truck with HID or LED bulbs can make a dramatic difference in your ability to see long distances. Dozens of articles and videos on the Internet compare the two technologies. Piecing together information from all of them and wading through the marketing hyperbole can take time. Let’s lay out the features and benefits of LED and HID lights to help you choose the solution that will work best in your vehicle.

The Fundamentals of HID Lighting Systems

High-intensity discharge (HID) lamps operate by applying 80 to 90 volts across a quartz glass arc tube filled with xenon gas at pressures between 70 and 700 psi, depending on the design and application. The current flowing through the arc tube causes the mercury and metal halides in the bulb to ionize into plasma and produce a bright light.

HID bulbs will not light (ignite) from the standard ~85V supply voltage and require an even higher voltage to begin the ionization process. An initial voltage of 15,000 to 25,000 volts is applied to the arc tube where a small amount of argon gas helps the voltage to travel from one electrode to the other and create heat. The process is similar to the way a coil pack creates a spark across spark plug electrodes to ignite the air and fuel mixture inside your engine. The heat created by the spark begins the mercury ionization process. In most applications, the ignition process takes 10 to 15 seconds. The ignition process can be made faster, but this would decrease the life of the bulb and the control ballast.

How Do LED Bulbs Work?

By comparison, LEDs are simpler from a mechanical perspective but more complicated in terms of chemistry. Using a process called electroluminescence, light-emitting diodes are solid-state devices that emit light when current in the form of electrons passing through the semiconductor recombines with electron holes and releases energy in the form of electrons. If you are having sporadic flashbacks to 9th- or 10th-grade chemistry class, then we’ve done our job.

Unlike HID bulbs, LEDs don’t require anything special to get them started, and contrary to popular belief, both HID and LED lighting systems draw roughly the same amount of power when in operation, at about 3.0 amps per bulb.

Drawbacks of HID Bulb Upgrades

While HID bulbs are amazingly bright and efficient compared to incandescent bulbs, your installer needs to find a location to mount the starter circuitry and high voltage power supply — a device commonly referred to as a ballast. Finding a solid mounting location is critical to the long-term reliability of these components.

HID bulbs require up to 15 seconds to reach their full light output capability. For this reason, they are not an ideal solution for high-beam applications where you need instant light in a “flash to pass” situation.

Finally, it is imperative to the long-term reliability of a HID lighting system that it be provided with adequate voltage and current during the startup process. The creation of the >15,000-volt spark can draw as much as 10 amps of current per bulb. The increasingly smaller factory wiring found in modern vehicles, along with the fact that headlights are usually left on during the engine cranking process, can make delivering the full electrical system voltage at a draw of 10 amps per ballast difficult.

When wiring is undersized, you may find that one bulb doesn’t ignite when you turn on your headlights. For this reason, HID system manufacturers strongly recommend the use of a dedicated, high-quality relay harness with a HID bulb upgrade. Direct connections to the battery for power and ground, relays rated for the high starting current of the system and quality all-copper conductors will help to ensure that your ballasts function efficiently and reliably.

Drawbacks of LED Bulbs

The rage over the last few years has been to use LEDs for bulb upgrades. As we mentioned earlier, LEDs reach their full output almost instantly, making them ideal for high-beam and turn signal applications. The primary problem with LEDs bulbs is managing their heat. If the LED chips on the bulb exceed about 257 degrees Fahrenheit (125 degrees Celsius), they can fail quickly. For this reason, LED bulbs include cooling fins in the form of braided copper strands or aluminum bands to help carry heat away from the LED chips. Some designs use small cooling fans. As long as the bulb is fully enclosed in a dust-proof housing, fan-cooled LED bulbs can work well.

LED bulb manufacturers have a wide choice of LED chips to use in their bulb designs. The goal of the bulb design is to place a light source in the exact same position as you’d find in an incandescent bulb. The filament in an incandescent bulb is long and narrow, so the LED array should be similar in order to maintain the proper beam pattern. One problem with LED bulbs is that they don’t produce a 360-degree source of light and may require adjustment and tuning to achieve a satisfactory beam pattern.

Is HID or LED Better?

Deciding which bulb upgrade is better for your car is like trying to decide if a red Ferrari is better than an orange McLaren. They are as different as they are similar. We spoke with Chris at HIDCOR Industries, a 20-year veteran of the automotive lighting industry, about lighting upgrade options. He told us that he starts each consultation by asking the client why he or she wants to upgrade their lights. The two most common answers are for looks and for performance. If you want that classy, modern white light, then he suggests LEDs are the way to go. They are easy to install and very reliable. If long-distance vision is the goal, then Chris suggests a 4300K (OEM color) or 6000K (pure white) HID upgrade along with a dedicated wiring harness to deliver every ounce of output possible. The HID upgrade is more involved as the ballasts and harness need to be installed properly, so it might be a little more expensive once the dust settles.

Chris explained his reasoning for HID over LED for long-distance lighting needs, but we’ll save that for another article at another time. In the meantime, if you are interested in improving your ability to see safely at night, drop by your local specialist mobile enhancement retailer and ask about the HID and LED bulbs that are available for your vehicle.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

When it comes to driving in the dark, the quality and quantity of lighting you have is paramount to your safety, and the safety of those around you. In recent years, automakers have begun to put significant effort into their lighting systems. From the days of incandescent lighting to upgrades with halogen gases, high-intensity discharge (HID), light-emitting diodes (LEDs) and – most recently – lasers, lighting has come a long way. The aftermarket is evolving quickly as well, so let’s look at some of the options that can make your nighttime drive safer.

Light Source Options

Factory headlight replacement options are the most popular upgrades available. There are three basic options: incandescent, LED and HID. Incandescent bulbs use a high-temperature filament that glows white-hot when current passes through it. Advances in materials and the selection of gases that are used in the construction of the light bulb have improved efficiency and longevity, as well as increased light output. A few years ago, tinted incandescent bulbs were popular – they gave the white/blue appearance of high-dollar HID kits. However, any time you put something between the light source and what you are trying to illuminate, you decrease the light output. Cool? Yes. Bright? Not so much.

The latest rage is LED lights. Vehicles like the Toyota Corolla, Acura MDX and new Honda Civic are available with LED headlights. These light sources are very bright. They produce full output very quickly when turned on. In the aftermarket, LED replacement headlight bulbs are becoming more and more popular. The quality of LEDs available is increasing in tandem with demand. However, the light output (measured in lumens) is still a little behind that of HID bulbs. LED lights often cost more, because not as many are being produced – a supply-and-demand issue. LED lights also require external cooling. Aluminum heat sinks, braided metal tabs and fans are common solutions for helping to dissipate the heat generated by LEDs. These can pose challenges regarding installation and available space.

The 1996 Lincoln Mark VIII is credited as being the first production vehicle with HID headlights. This system works by increasing the 12V vehicle electrical system voltage up to around 100 volts. This voltage goes to a pair of electrodes in a gas-filled chamber. A steady spark between the two electrodes is what produces the light. However, it takes around 25,000 volts to get the lights to start working. That’s why you get a small, bright flash when you first turn on an HID system. HID lights are among the brightest on the market. The color of the light they produce is closer to that of sunlight, with more blue content than with incandescent bulbs.

Light Color

We should talk about light color, or more accurately, light temperature is rated on the Kelvin scale. Lower numbers, around 3,500–4,500 K have significant yellow and orange content, and are similar to incandescent bulbs. Moving up the scale, 4,500–6,000 K is bluer and closer to sunlight. That said, as the blue content increases, so can the propensity for eye fatigue – blue light can be tiring to look at. You don’t want to go too high for daily use. Bulbs rated at 6,000–10,000 K are for appearance purposes only. The light becomes more purple toward the high-end of the spectrum. These are fine for a show car, but not practical or safe for daily use.

Light Intensity

Many people believe there is a direct correlation between color temperature and light output. That depends, of course, on the manufacturer of the bulb. The thinking is that lower temperatures produce more light output. Ultimately, the amount of light that is produced will determine how much and how far you can see.

Light output is measured in lumens. More lumens means more brightness, which, for a given beam pattern, means that the road will be illuminated better.

Beam Pattern

When upgrading your headlights, it is critically important that you are conscious of the resulting beam pattern. The light that is emitted from the front your vehicle is in a specific pattern – not round like a flashlight. The beam has a flat line through it, ever so slightly below horizontal. This allows the light to illuminate the road without blinding oncoming drivers. The light should also be brighter near the edge of this cutoff, putting more light down the road rather than in front of the vehicle. Too much light in the foreground will cause your pupils to close slightly, reducing how far down the road you can see.

Likewise – and this is a great night driving tip – the brightness of the vehicle interior can have the same effect. Keep the dash and radio illumination as dim as possible. That can help you see further down the road.

If the new light bulbs you install change the beam pattern, remove them. They are not compatible with your headlights, and they will blind oncoming drivers. This is extremely dangerous and can cause accidents.

Headlight Styles

There are two types of factory headlight assemblies in use today: reflector style and projector style.

The projectors are fairly easy to recognize – they have smallish, 2–3” round lenses. Reflectors have a large, molded, mirror-finish bowl behind the light. While one is not necessarily better than the other, you do need to know which you have when you go shopping for upgrades. Aftermarket HID kits don’t typically work properly in reflector-style headlight assemblies. The beam pattern becomes uncontrolled, pointing light into the eyes of oncoming drivers. In many cases, depending on the specific design of the kit you choose, you can use an LED upgrade in those applications.

In projector-style systems, the shape of the internal reflector is designed to work with either incandescent or HID style bulbs. The position and shape of the light source differs between these two bulb types. You can often get away with putting HID bulb kits in a projector designed for Incandescent bulbs without any detrimental effects, but they may not be quite as bright or focused as an HID bulb in a projector designed specifically for that application.

Retrofits

If you are looking for the ultimate lighting upgrade, you may want to contact your local mobile electronics specialist about a retrofit. A retrofit involves removing the headlights from the vehicle, taking them apart, and installing new projectors with OEM-quality bulbs and ballasts. Most of these solutions use what is known as a bi-xenon projector. These projector assemblies have motorized shutters that move to produce a “high beam” light pattern. The output of these systems is among the best there is – perfect beam pattern, excellent cutoff and great light output. Some headlights are easier to work on than others, so contact a local specialist for details about your lights.

You can also make some cosmetic changes while the lights are apart. The installation of LED halo rings, and painting some of the interior components can have a dramatic effect on the look of the vehicle.

Wiring

When you want to change headlights, wiring is often involved. Many new vehicles have systems in place to detect when a bulb is burnt out. They can also modulate the voltage to high-beam lighting circuits to operate them as daytime running lights.

When it comes to wiring, nobody is better than your local car audio specialist retailer. Work with them to ensure that your new light wiring can provide enough current and operates the way it should. Relays, capacitors and load resistors may be required to achieve the results you want. Don’t ever skimp on wiring – it affects the reliability of the lights you install, and your safety is at risk.

A Word of Caution About Vehicle Lighting Upgrades

We want to remind you that your headlights are a tool. They are not toys, and their performance and reliability are of the utmost importance to your safety and the safety of those you share the road with. Lighting upgrades are a great way to improve your safety at night. Drop by your local mobile electronics specialist and discuss your options.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.