A modern car is a complex technical device, where the lighting system plays not only a decorative, but also a vital role. Traffic safety in the dark directly depends on the serviceability and correct settings of all lighting devices. The driver must clearly distinguish the functional purpose of each light source so as not to blind oncoming cars and see the road situation for himself.
The history of the development of automobile lighting has gone from primitive kerosene lanterns to complex matrix LED systems with artificial intelligence. However, the basic principles remain the same: the light should illuminate the path and indicate the dimensions of the vehicle to other road users. Understanding these principles helps you avoid fines and accidents on the road.
In this article we will analyze in detail all types of light, their differences and rules of use. You will find out how they differ xenon lamps from halogen, why you should not confuse fog lights with daytime running lights and how to properly adjust the beam of light. This knowledge is necessary for every car owner, regardless of driving experience.
Side lights and license plate lights
The first level of light signaling is side lights. They are intended to indicate the width and height of the vehicle in conditions of poor visibility when the use of headlights is not yet required or has already been discontinued. The dimensions are always red at the rear and white at the front, which allows you to instantly determine the direction of movement of the car.
Illumination of the state registration plate is a mandatory element of the package. According to the rules, the license plate must be read at night from a distance of at least 20 meters. For this purpose, special lampshades are used, which are often integrated into the design of the rear lights or located separately above the license plate.
It is important to ensure the cleanliness of license plate lights, as road dirt can completely hide the symbols from cameras that record violations. The absence of a working license plate light is equivalent to a malfunction of the lighting devices and entails administrative liability. In modern cars, energy-efficient LEDs are often responsible for this function.
What happens if the marker lamp burns out?
If one of the lights burns out, the corresponding indicator on the dashboard lights up (usually the green icon of two flashlights). In older cars without an on-board computer, this can only be noticed during an external inspection or by seeing the asymmetry of light on the road. Driving with one marker is technically a violation, since the marker lights must indicate the full width of the car.
Low and high beam headlights
The driver's main tool at night is the headlight system. Low beam designed to illuminate the road ahead of the car at a distance of 30–40 meters. Its cut-off line is clearly cut off so that the beam does not rise above the eye level of the driver of an oncoming car, preventing him from being blinded.
High beam provides road illumination at a distance of 100–150 meters or more. It is used on unlit sections of highways in the absence of oncoming traffic. Switching between modes is carried out by the driver manually or automatically, depending on whether the vehicle is equipped with systems such as Auto High Beam.
It is critically important to remember the switching rules: the high beams should be turned off 150 meters before an oncoming car, as well as when following a car in front at a close distance. Glare from the rearview mirror may cause the other driver to lose control. In urban environments with artificial lighting, the use of high beams is prohibited.
It is better to check the cut-off line of the low beam on a flat area near a wall. The distance to the wall should be about 5 meters. The upper edge of the light spot should not rise above the center of the headlight. If the light shines upward, adjustment is necessary using a hydraulic corrector or at a service center.
Fog lights and their features
Fog lights (PTF) are often mistakenly perceived as simply additional light sources, but their design is strictly specific. They emit a wide, flat beam of light that spreads over the road, illuminating markings and the side of the road, but without reflecting from drops of fog or snow dust back into the driver's eyes.
The use of PTF is permitted only in conditions of poor visibility: fog, rain, snowfall, smoke. On a clear night, their use is impractical and can create glare on wet asphalt, interfering with visibility. Many modern cars are equipped with PTF only in expensive trim levels or as an option.
The rear fog lights (red) are much brighter than regular ones. Their task is to make the car visible in dense fog.
⚠️ Attention: It is strictly forbidden to use rear fog lights in clear weather, as they dazzle drivers behind them more than brake lights.
☑️ Check readiness for fog
Daytime running lights (DRL)
Daytime running lights (DRL) is a relatively new safety requirement that has become mandatory for all new cars. Their main function is to increase the visibility of the vehicle during daylight hours. Unlike their dimensions, DRLs have high brightness, and unlike low beams, they consume minimal energy.
Drivers often confuse DRLs with automatic low beams. The main difference is that when the DRLs are on, the rear lights (dimensions and license plate lights) may not light up. This saves lamp life, but requires the driver to be attentive: in a tunnel or when entering an underground parking lot, you need to manually turn on the lights, as the automation may not work.
The luminous flux of the DRL is directed strictly forward and is not intended to illuminate the road surface. Legislation strictly regulates their color (white only) and brightness so that they do not dazzle oncoming drivers, but are clearly visible from the sides and front. Installing uncertified Chinese analogues often leads to problems when passing a technical inspection.
Daytime running lights do not replace low beams at night. Their task is only to indicate the car during the day.
Special signals and interior lighting
In addition to external headlights, the car is equipped with a warning light system. Brake lights light up when you press the brake pedal, warning drivers behind you to slow down. Direction indicators (flashing orange) inform about the maneuver. A special feature is the hazard warning system, which turns on all turn signals at the same time.
Interior lighting (plafond) is also part of the system. Although it does not affect movement, turning on the interior lights at night reduces visibility through the windshield due to reflections in the glass. Professional drivers try to minimize the use of bright interior lights while driving.
The light signaling of special vehicles deserves special attention. Flashing lights of blue, red, orange or yellow have a strictly defined purpose and are only allowed for the corresponding services. Installing such lights on a civilian vehicle is a gross violation of the law.
Technologies and types of lamps
The evolution of light sources in cars has led to the emergence of three main types of lamps, each with its own advantages and disadvantages. The choice of light type affects not only the quality of lighting, but also the cost of car maintenance.
- 💡 Halogen lamps: The most common and cheapest option. They give a warm yellowish light, penetrate rain well, but have a short service life and low energy efficiency.
- 💡 Xenon lamps: Gives a bright blue-white light, lasts longer than halogen, but requires a lens and ignition unit. Without a lens they blind oncoming traffic.
- 💡 LED: Modern standard. They flare up instantly, consume little energy, have a huge resource, but are afraid of overheating and, as a rule, cannot be repaired (the entire headlight is replaced).
When choosing a replacement for a burnt-out lamp, it is important to consider not only the base, but also compatibility with the headlight optics. Installing powerful lamps in a standard reflector headlight results in chaotic light scattering and blinding other drivers.
Comparison table of characteristics
For the convenience of comparing the main parameters of various types of light and sources, consider the following table. It will help you understand the difference in power consumption and brightness.
| Source type | Average brightness (Lm) | Service life (hours) | Consumption (W) |
|---|---|---|---|
| Halogen (H7) | 1500 | 500 - 1000 | 55 |
| Xenon (D2S) | 3200 | 3000 | 35 |
| LED (Analog H7) | 4000+ | 30000+ | 20-30 |
As can be seen from the table, LEDs and xenon are significantly superior to halogen in brightness and durability. However, high brightness requires a more complex and expensive control and cooling system.
Why can't xenon be installed in a regular headlight?
A xenon lamp has a different arc length and emission spectrum. The reflector of a regular halogen headlight cannot focus this light correctly. The result is a “mess” on the road and a powerful upward glare that blinds oncoming traffic. For xenon, a lens is required.
Legal aspects and regulation
The use of lighting devices is strictly regulated Traffic rules and technical regulations. Violating the rules for using light (for example, driving with headlights off at night or using "collective farm" xenon) entails fines and, in some cases, deprivation of your license.
Particular attention is paid to color temperature and lamp power. Installing lamps that are not suitable for the vehicle type is classified as a modification to the design. In practice, this means that you can get serious penalties for having bright blue or purple bulbs in your headlights.
Headlight adjustment is another important aspect. Even the most expensive lamps will not work correctly if they are not tuned. The adjustment must be carried out on a specialized stand, where the correct angle of the light beam is set depending on the vehicle load.
⚠️ Attention: Self-tinting of headlights or installation of color films on lighting devices is prohibited. This reduces light transmission and changes the color of the signal, which is grounds for prohibiting the operation of the vehicle.
Frequently asked questions (FAQ)
Is it possible to use high beams in the city?
The use of high beams in populated areas is permitted only on unlit sections of roads. If there are street lights, the headlights should be set to low beam to avoid blinding pedestrians and other drivers.
What to do if the glass in the headlight fogs up?
A slight condensation that disappears after turning on the light is acceptable. If large drops or puddles of water form inside the headlight, the seal is broken. It is necessary to look for a crack or a loose cover, otherwise a short circuit or lamp failure is inevitable.
Is it necessary to turn on the lights during the day?
According to traffic regulations, during daylight hours all moving vehicles must have daytime running lights on. If they are not structurally provided for, it is necessary to turn on the low beam headlights.
How often should lamps be changed?
Lamps need to be replaced as they burn out. However, it is recommended to check their condition before each long trip. Halogen lamps fade over time, so preventative replacement of them in pairs (both headlights at once) can improve the quality of light.