The question of which light is more correct and safe to drive during daylight hours worries many motorists. On the one hand, there is a requirement of traffic rules to indicate a vehicle on the road, on the other hand, drivers often argue about what is more effective: low beams, daytime running lights or fog lights. Not only the penalty statistics, but also the actual visibility of your car to other road users depends on the selected lighting mode.
Modern technologies offer many options, from classic halogen lamps to advanced LED modules and laser optics. However, despite technological progress, the basic principles of visibility remain unchanged: the light must be directional, bright enough, but not blinding. In this article, we will take a closer look at the physical and legal aspects of using different types of lighting.
Many drivers mistakenly believe that during the day, headlights are needed solely to “show off” in front of the inspector. In fact, turning on your running lights or low beams helps pedestrians and other drivers react more quickly to an approaching vehicle, especially in bad weather or difficult terrain. The correct choice of light source can be a decisive factor in preventing an emergency.
Traffic regulations and legal aspects
Most countries, including the Russian Federation, have strict rules regarding vehicle markings during daylight hours. According to clause 19.1 of the traffic rules, drivers are required to turn on low beam headlights or daytime running lights (DRL) when driving during daylight hours. Ignoring this requirement may result in administrative penalties in the form of a fine.
⚠️ Attention: The use of fog lights (FTL) as the main daylight is permitted only in combination with low beams or DRLs, and not instead of them, unless the design provides otherwise.
The law clearly distinguishes between the concepts of “low beam” and “running lights”. Low beam is designed to illuminate the road at night and has a certain cut-off line. Daytime running lights, in turn, are designed to be as visible as possible during the day, but are not intended to illuminate the roadway. Their luminous intensity is usually higher than that of side lights, but lower than that of low beam headlights.
Legal conflicts often arise when installing non-standard equipment. If a car comes from the factory with only side lights, and the owner installs bright LED lamps, calling them DRLs, this is a violation. The inspector has the right to demand dismantling of the equipment, since the type (of the light source) must correspond to the markings on the headlight and the design of the vehicle.
Low beam vs daytime running lights
The main difference between low beams and DRLs lies in their purpose and energy consumption. Low beam consumes more energy because it uses powerful filaments or diode arrays to illuminate the path. Turning on the low beam during the day leads to increased fuel consumption (on older cars) or battery charge, and also reduces the life of the lamps.
Daytime running lights do not have this drawback. They consume minimal energy and have a huge service life. However, their effectiveness depends on the quality of execution. Cheap Chinese DRLs can quickly degrade, lose brightness, or have an uneven light beam, which reduces their visibility.
From a safety point of view, DRLs are often preferable because they do not require driver intervention after the engine starts (provided they are automatically turned on). This eliminates the human factor and the risk of forgetting to turn on the light. Low beam requires constant monitoring, although modern automatic lighting systems (Auto Light) solve this problem too.
- 🚗 Visibility: DRLs are more visible in bright sunshine, as they have a cooler emission spectrum.
- 🔋 Economical: DRLs consume 5-10 times less energy than halogen low beam lamps.
- 🔆 Dazzle: Correctly adjusted DRLs do not blind oncoming drivers, unlike incorrectly adjusted low beams.
Fog lights: can you drive during the day?
The use of fog lights (FFL) during daylight hours is a topic full of myths. Many drivers believe that PTFs shine brighter and better, so they can be used as DRLs. This is a misconception. Fog lights have a wide, flat beam of light that extends over the road to illuminate lane markings and the side of the road in foggy conditions. During the day, this light diffuses and is less effective in indicating the vehicle's dimensions.
In addition, PTF light often has a yellowish tint (especially halogen), which is less perceived by the human eye against the backdrop of a bright day compared to white or bluish LED light. The use of only “foglights” without dimensions or low beams can be regarded as a violation if this is not provided for by the design of the car as a DRL mode.
Why do PTFs become blind in clear weather?
Fog lights have a very wide beam angle. In foggy or rainy conditions, light reflects off the droplets, creating a wall of light. In clear weather, this wide beam, aimed low, can hit the eyes of drivers of tall cars or motorcyclists, causing discomfort, although it does not dazzle as much as high beams.
If you plan to use the fog lights during the day, make sure they are turned on along with the side lights or low beams, as required by the rear fog light regulations, although the front ones often have their own nuances depending on the markings.
Comparison table of lighting types
For clarity, let's compare the main characteristics of various light sources used for daytime driving. This will help you understand which option is best for your car.
| Light type | Consumption (W) | Resource (hours) | Visibility during the day | Impact on the battery |
|---|---|---|---|---|
| Halogen (Middle) | 55-60 | 500-1000 | Average | High |
| Xenon (Middle) | 35 | 2000-3000 | High | Average |
| LED (DRL) | 5-10 | 30000+ | Very high | Minimum |
| PTF (Halogen) | 55 | 500-800 | Low/Medium | High |
From the table it is clear that LED technologies leaders in all respects, except, perhaps, the initial cost of installation. This is why modern cars are increasingly equipped with LED-based DRLs from the factory.
Glare problem and headlight adjustment
Even the best quality light can become dangerous if it is not set up correctly. Dazzle of oncoming drivers is one of the main causes of accidents on the roads. Drivers often forget that when loading the trunk or loading passengers, the car body rises and the angle of the headlights changes. The light that was illuminating the asphalt a second ago now hits straight into my eyes.
For correct operation of the optics, it is necessary to monitor the headlight hydrocorrector. In most modern cars it is electric and is controlled by a button in the cabin. In older models there is a manual corrector that needs to be turned manually.
☑️ Checking the light adjustment
If you notice that oncoming drivers frequently flash their headlights at you, this is a sure sign that your headlights are shining too high. Do not ignore these signals, as you are creating an emergency situation.
⚠️ Warning: The installation of xenon lamps in reflector headlights designed for halogen is prohibited and results in a strong glare effect, even if the headlights are adjusted.
Technical nuances: LED, Xenon or Halogen?
The type of lamp you choose depends on the design of your optics. Halogen lamps are the cheapest and most common option, but they get very hot and have a short lifespan. Xenon The lamps produce bright white light, but require an ignition unit and headlight washers by law. LED lamps are a modern standard that combines brightness, durability and efficiency.
When choosing lamps, pay attention to color temperature. For daylight, the optimal range is considered to be from 4000K to 6000K. Light with a temperature above 6000K goes into the blue spectrum, which penetrates fog and rain worse, and also tires the eyes faster.
When replacing lamps, never touch the glass bulb of a halogen lamp with bare hands. Oil from the skin will lead to local overheating of the glass and rapid failure of the lamp. Use a tissue or gloves.
It is also important to consider compatibility with the vehicle's electronics. Some LED lights may cause a "Check Engine" error or flashing due to low current consumption. In such cases, the installation of additional decoy resistors or CAN buses is required.
The influence of weather conditions on the choice of light
The weather dictates its conditions. On a clear sunny day, the brightness of the DRLs or low beams may seem excessive, but it is at these moments that the contrast of the car's silhouette against a bright sky or glare is important. In cloudy weather, rain or snow, lighting requirements increase.
In foggy conditions, low beam can create a “wall of light” by reflecting off moisture droplets. This is where fog lights come to the rescue with their wide and low beam. However, during the day the fog is often thin and the standard low beams or DRLs are sufficient to identify yourself.
In winter, when daylight hours are short and snow reflects light, proper lighting is critical. Snow porridge on the side of the road can hide pedestrians in dark clothing, and here the bright white light of LED or xenon will help to notice them earlier than the yellow light of halogens.
There is no universal solution: in clear weather it is better to have DRLs, in fog - PTF + low beam, and in twilight and at night - only high-quality low beam with the correct adjustment.
Frequently asked questions (FAQ)
Is it possible to drive during the day with only side lights?
No, side lights are not intended to indicate a vehicle in motion during daylight hours. They are too dim and do not provide the necessary visibility. There is a fine for this.
What happens if one of the DRL lamps burns out?
The car will become less noticeable, which is dangerous. In addition, this is a violation of traffic regulations (faulty external lighting devices), for which the inspector may issue a fine or require the fault to be corrected on the spot.
Do I need to turn on the light in the tunnel during the day?
Yes, absolutely necessary. Even if the tunnel is well lit, the difference in brightness when entering can disorient other drivers. Turning on the light makes your car visible in the twilight of the tunnel.
Is it possible to install DRLs in the bumper yourself?
Technically, it is possible, but legally this is considered to be making changes to the design of the vehicle. Legalizing such changes requires certification and recording of documents, which is difficult and expensive. It is easier to use certified kits.
Is it true that DRLs are harmful to the environment?
On the contrary. Since modern daytime running lights consume minimal energy (especially LED), they reduce the load on the generator and, as a result, engine fuel consumption, which has a positive effect on the environment compared to constantly burning halogen headlights.