Many motorists still confuse the two types of light fixtures installed on the front of the vehicle. Visually, they can be located next to each other, and sometimes they can be combined in one block, which creates the illusion of their identity. However, daylight and position lights perform fundamentally different functions, have different technical requirements and operating modes.
Confusion occurs not only for beginners, but also for experienced drivers, especially after the introduction of mandatory use. DRL (Daytime Running Lights) traffic. Failure to understand the difference between these light sources often leads to errors in the operation of the car, improper installation of additional equipment and, as a result, to fines from traffic police inspectors.
In this article, we will discuss the physical and legal differences between these devices. You will learn why you can not use dimensions instead of DHO during the day, how to check the compliance of your lamps with the requirements of GOST and what schemes exist for legal installation. Understanding these nuances will help avoid problems on the road and ensure that your car’s electrical system works properly.
Functional purpose and modes of operation
The main difference lies in the purpose of lighting devices. Positioning lamps are intended to indicate the width of the vehicle in low visibility conditions, for example, at dusk, at night or in a tunnel. Their task is to show other participants that there is a car on the road and determine its dimensions. They are part of a lighting system that is activated by the driver or automatically when the main light is turned on.
In turn, daytime running lights (DHO) They are designed to make the car visible during the day. Their brightness is much higher than that of the dimensions to penetrate sunlight and attract attention. According to modern regulations, the use of DRLs during the day is a mandatory requirement to improve road safety, reducing the risk of head-on collisions.
It is important to note the difference in the inclusion algorithms. Dimensions usually burn constantly, while the appropriate switch is on or the headlight is working. DRLs should be automatically lit when the engine is started and extinguished when the engine is stopped, or when the passing beam of the headlights is turned on (depending on the specific implementation in the car). The key difference: DHO should be brighter than the dimensions and work only with the engine running.
If you install the DRLs yourself, make sure they go out when you turn on the passing beam if your car’s circuitry requires it, or work in parallel but with less brightness if it is implemented through dimming.
Technical requirements: brightness and color of glow
Technical regulations, such as GOST R 41.48-2004, strictly regulate the parameters of the emitted light. For daytime running lights, a minimum luminous intensity of 400 candelas (cd) and a maximum of 1200 cd are set. This is necessary so that the light is clearly visible even under direct sunlight. The overall lights are much less bright, usually from 4 to 60 cd, as their task is not to blind other drivers in the dark, but only to indicate the contours.
The color scheme is also strictly defined. Both the DRL and front dimensions should emit white light. However, the shade and spectral characteristics may differ. DHOs often have a cooler, bluish hue (color temperature around 6,000K), which improves their perception by the human eye during the day. Dimensions can be made in a warmer spectrum, especially in older models with conventional incandescent lamps.
When installing non-standard equipment, there is often a problem of brightness mismatch. If you put LED lamps in size and use them as DHO, you may be stopped for “the dimensions are too bright”. Conversely, the use of dim lamps as DHOs makes no sense and can be regarded as a malfunction of lighting devices.
- 💡 Daylight strokes should be much brighter than the dimensions for visibility during the day.
- 🎨 Both types of appliances emit white light, but the color temperature can vary.
- ⚙️ The maximum intensity of the DRL is limited to 1200 cd in order to avoid dazzling.
- 🔋 Energy consumption of LED DHOs is minimal compared to halogen dimensions.
Legal aspects and requirements of traffic rules
The traffic rules clearly spell out the requirements for the use of external lighting devices. Paragraph 19.5. states that passing beam headlamps shall be switched on in all moving vehicles during daylight hours or daylight. The use of position lamps for this purpose is not permitted and is considered a violation.
Inspectors of the traffic police during the inspection pay attention to the mode of operation. If you are driving in the afternoon with the dimensions turned on, this can be regarded as a violation of the rules for using external lighting devices. The penalty for this, according to part 1 of article 12.20 of the administrative code of the Russian Federation, is a warning or 500 rubles. Although the amount seems small, systematic violations can lead to problems in communicating with the law.
There is also a nuance with the terminology in the documents. The vehicle registration certificate (VTC) may indicate “passing beam headlamps” or “fog headlamps”, but the separate line “DRL” may not be included if they are incorporated into the main unit. This does not mean that they are not there – just factory equipment implies their presence. If you have installed the DRL yourself, they must be certified for use on public roads.
⚠️ Note: Installation of uncertified DHOs or self-insertion of LED tapes into the bumper without appropriate design can lead to a refusal to undergo a technical inspection and a ban on the operation of the vehicle.
Comparative Characteristics Table
For ease of perception of information, we will reduce the main differences in a single table. This will help you quickly navigate the technical parameters and avoid confusion when buying spare parts or communicating with electricians.
| Parameter | Positioning lamps | Daytime running lights (DWL) |
|---|---|---|
| Substantive function | Designation of car width at night | Designation of the car by day for safety |
| Light intensity (min/max) | 4 - 60 cd | 400 - 1200 cd |
| Incorporation regime | Manually or with passing lights | Automatically at engine start-up |
| Energy consumption | Low (especially LED) | Average (depending on power) |
| DAY SDA requirement | Not a substitute for DHOs. | Mandatory to use |
From the table it can be seen that the difference in light intensity is colossal - DHOs should shine at least 10 times brighter than their dimensions. That is why the use of dimensions during the day is ineffective: in bright weather they simply will not be visible from afar, which negates the sense of their inclusion.
The myth of "blinking mode"
Some drivers believe that DHOs should blink. That's wrong. According to GOST, DHOs should be lit with constant light. Flashing lights are allowed only for special vehicles or as an alarm.
Problems of self-installation and connection
Owners of cars in which the plant does not provide for DRLs, often decide to install them themselves. There are many mistakes here. The most common is connecting DHO directly to the position lights. In this case, the bright LEDs DHO will work full-time (if not provided by the scheme), quickly fail or, conversely, burn out the wiring of dimensions due to overload.
The correct connection scheme requires the use of a separate relay or controller. The algorithm should be as follows: DRLs light up when the voltage is applied to the ignition lock (or oil pressure sensor) and go out when the position light or passing beam of the headlights is turned on (so-called dimming or complete shutdown). This is a requirement to avoid blinding other drivers at night.
When installing, it is important to take into account the heating of the elements. LED DHOs, despite their efficiency, are sensitive to overheating. They cannot be sealed inside the bumper without heat sink. Wires of at least 1.5 mm2 should also be used to connect to avoid voltage drops and wiring heating.
☑️ Checking the correctness of the installation of DHO
Impact on the electric network and the resource of the AKB
The switch to LED DHOs significantly reduces the load on the generator and battery pack compared to the use of passing headlights. While standard dipped-beam bulbs consume about 55-60 watts each, modern DRL LED modules consume only 5-10 watts per side.
This is especially true for cars with low battery capacity or in winter, when battery life is limited. Constant operation of powerful passing beam lamps in the city with frequent stops can lead to undercharge of the battery. DHOs solve this problem by ensuring the visibility of the car with minimal power consumption.
However, when installing low-quality Chinese analogues of DHO, you can face the problem of interference. Cheap ignition units or LED drivers can create tips in the onboard network, which affects the operation of the audio system, sensors and even the engine ECU. Therefore, it is not worth saving on the components of the lighting system.
⚠️ Note: When installing powerful DHOs, be sure to check the status of contacts in the safety unit. Weak contact can lead to melting of plastic and short circuit.
Using high-quality DRLs instead of constantly turning on the passing beam headlamps saves fuel and prolongs the life of headlight lamps and the battery.
Frequently Asked Questions (FAQ)
Can I use fog lamps (FLDs) instead of DRLs?
PTFs can be used as DHOs only if their brightness meets the requirements of GOST for daytime running lights (at least 400 cd) and they have an automatic switching algorithm. However, most full-time PTFs shine too wide and can blind oncoming drivers if not configured correctly. In addition, according to traffic rules, PTF can be used only in low visibility conditions or at night, so their inclusion in the day can be regarded as a violation.
Is there a penalty if one of the running lights is burned?
Yes, the operation of a vehicle with defective external lighting devices is prohibited. If one DHO does not burn, it is considered a malfunction. The inspector has the right to issue a fine under Article 12.5 of the Administrative Code of the Russian Federation. In addition, it reduces the visibility of the car to other road users, increasing the risk of an accident.
Do you have to dimm (decreased brightness) DHO at night?
According to the technical regulations, the DRLs must be automatically turned off when the headlight is turned on. If they don’t turn off but continue to burn with the same brightness, it can blind other drivers. Some systems implement dimming (dimming) to the level of dimensions, which is also acceptable, but a complete shutdown is preferable for safety.
Can I tint the DHO plafonds?
No, tinting of any lighting devices, including DHO, is prohibited. This reduces light transmission and changes the color of radiation, which is a direct violation of the safety requirements of the vehicle. For this, there is a fine and the possibility of removing numbers.