ECE R149: what this regulation means for driving lights, LED bars lights and headlights

What does ECE R149 mean for vehicle lighting?

Watch the video for a short explanation of ECE R149 and the role of this regulation in the technical approval of front vehicle lighting.

What is ECE R149?

UN Regulation No. 149, also known as Road Illumination Devices (RID), sets out the requirements for the type approval of various road lighting functions. When it was introduced in 2019, the regulation consolidated the previous regulations R19, R98, R112, R113, R119 and R123. Its initial introduction was primarily a simplification of the regulatory framework; it did not mean that all existing photometric requirements were suddenly tightened.

When choosing a light, it is not only the R149 designation that is relevant, but above all the function for which the specific product has been approved. An approved main-beam function, for example, is different from a work light with a focused light beam.

To which lighting does R149 apply?

• Low beam and high beam (passing beam and driving beam), including approved supplementary driving lights and LED bars.
• Adaptive front-lighting systems (AFS) and certain adaptive main-beam functions.
• Front fog lights and cornering lamps, insofar as the relevant function and vehicle category fall under R149.

Which functions fall under R149 depends in part on the vehicle category. The regulation covers, amongst other things, relevant lamp functions for categories L, M, N and T. Position lights (DRL), on the other hand, are a light-signalling function under UN R148. R149 is therefore not a general approval for all front-facing lighting.

Different regulations apply to installation: these include UN R48 for vehicles in categories M and N and their trailers in category O, as well as other applicable regulations for, for example, certain two- and three-wheelers and agricultural vehicles. R149 concerns the approved light function, not an unrestricted right to fit that light to any vehicle.

What does R149 mean for LED driving lights and LED bars?

An LED driving light or LED bar can be used as an additional main-beam unit provided that a valid approval for the main-beam function exists for the specific model and the vehicle installation complies with the applicable regulations. Therefore, always check the exact function for which the light has been approved.

Type	Meaning in practice
Approved for use as a high beam	The light has a valid type approval for the main beam function. Please also check the mounting, wiring and permitted configuration on the vehicle.
Work light or off-road version	A spot beam or the appearance of a driving light is not proof of high-beam approval. Use and activation on public roads depend on the function and the applicable regulations.
Older type-approval (e.g. R112)	Not automatically invalid. Check which approval has been issued, for which function, and under which transitional and authorisation conditions it applies.

A spot beam is a type of light distribution, whilst, within the regulations, a ‘ driving beam ’ refers to the full-beam function. Would you like to understand the difference between light distributions? Read the article ‘Flood beam, spot beam or combo beam: which beam pattern should you choose?’.

Driving lights with ECE R149

The selection below features LED driving lights from the TRALERT® range. For each model, please check the product specifications and the specific approved light function; any functions such as position lights or flashing lights have their own approval requirements.

How do you recognise an ECE R149 approved light?

On the conventional UNECE approval mark, the capital letter ‘E’ appears within a circle alongside a country code, for example ‘E1’ for Germany or ‘E4’ for the Netherlands. In addition, the approval number, the reference to the applicable regulation and the symbols for the approved function are relevant. The exact layout may vary depending on the light and combination of functions.

• Country code: indicates which country granted the approval, not in which country the light may be used exclusively.
• Approval details: check that the marking and product documentation confirm a valid approval in accordance with R149. The regulation number and the approval number are not the same.
• Function symbol: indicates which function has been approved, for example, high beam.
• Reference number: for relevant main-beam units, this is important for the vehicle’s combined maximum main-beam intensity.

So don’t just check for an ‘E’ mark. Approval in accordance with UN R10 relates to electromagnetic compatibility and does not, in itself, confirm high-beam approval. You can read more about the markings under the ‘E’ mark.

What is the difference between R149, R48 and R10?

Regulation	What is checked?	Example
UN R149	Approval of the road lighting function and technical requirements for the light.	Are driving lights approved for use as high beams?
UN R48	Installation of prescribed and authorised light functions on vehicles in categories M, N and O.	Is the number of main-beam units and their wiring configuration permitted?
UN R10	Electromagnetic compatibility.	Does the lighting cause unacceptable electrical interference?

To ensure the correct outcome, both the function of the light and its installation on the vehicle must comply with the regulations applicable to the specific application. ECE R149 and R48 are not interchangeable approvals.

ECE R149 versus R112: what has changed?

UN R112 was an important regulation governing certain headlights and main-beam functions. The original UN R149 consolidated the requirements from various older regulations. When it was introduced in 2019, the emphasis was primarily on harmonisation and clarity, rather than on immediately replacing all existing technical requirements with entirely new values.

R149 is now the standard framework for new approvals. This does not mean that an existing R112 approval automatically expires. Whether you can use an older product depends on the valid approval, the function and the regulations for the vehicle.

When purchasing older stock or replacing lighting, it is advisable to check the approved function and the accompanying documentation. Further background information can be found under ECE R112.

What should you bear in mind during mounting and use?

High-beam reference number

For main-beam lighting systems on vehicles covered by UN R48, the combined maximum main-beam intensity of the units that can be switched on simultaneously is, in principle, 430,000 candelas, corresponding to a Reference number of 100. The relevant Reference numbers of the units are assessed collectively for this purpose. The figure indicates the permitted total light output, not directly the quality of the light distribution. Please also read our explanation of the Reference number.

Calculation example: two main-beam units with a Reference number of 30 and two additional units with a Reference number of 25 add up to 110. If all four units can be switched on simultaneously, this exceeds the limit of 100. The exact vehicle configuration and applicable regulations remain decisive.

Circuit configuration and number of lights

Main-beam units must be switched in accordance with the applicable regulations, including when switching back to low beam. The permitted number and method of switching depend on the vehicle category, vehicle type and the relevant installation regulations. A separate R149 approval therefore does not exempt you from these requirements. If in doubt, please consult the current R48 installation regulations or the rules for your vehicle category.

Semi-trailers, agricultural machinery and work lights

R48 applies to categories M, N and O. The regulation does not permit a main-beam function on category O trailers. This does not mean that every shape of supplementary work light on trailer has the same function or approval status. For such lighting, you must assess the application and the regulations for the vehicle in question on a case-by-case basis.

The situation is different for agricultural vehicles: R149 may relate to the lamp function, whilst the relevant installation regulations for, amongst others, category T may be set out in other regulations, such as UN R86. A standard work light with a spot beam is not automatically an approved high-beam unit.

Checklist: is this LED driving light or LED bar suitable?

Would you like to select an LED driving light or LED bar for a truck, commercial vehicle or vehicle body? Check these four points before ordering or fitting:

1. Approved function: has this specific model actually been approved as a high beam headlamp? An E-mark or R10 designation alone is not sufficient.
2. Reference number: does the combined reference value of the high-beam units that can be switched on simultaneously fall within the applicable limit?
3. Mounting and wiring: does the planned flush mounting comply with the regulations for the relevant vehicle category?
4. Product specifications: do the voltage range, connections, dimensions and light distribution, amongst other things, suit the application?

For dealers, this serves as a practical checklist when advising on products. For bodybuilders, vehicle manufacturers and OEM customers, the list helps to select a suitable lighting configuration at an early stage. In case of doubt regarding the approved function, the product documentation takes precedence.

Frequently asked questions about ECE R149

Is R149 mandatory for every LED driving light?

No. The application is decisive. For use as an approved main-beam function, a suitable, valid type approval is required, nowadays usually in accordance with R149. A work light with a spot beam does not automatically have that main-beam function and does not fall under R149 solely on the basis of its beam shape.

Is R149 the same as an E-mark?

No. R149 is a UNECE regulation; the E-mark indicates that a product has been approved for a specific function in accordance with the relevant regulation. You should therefore also pay attention to the regulation number and the function symbols.

Is an R149-compliant LED bar always permitted on public roads?

No. The light must be approved for the relevant function, and the installation must comply with the regulations applicable to the vehicle. This includes the wiring, the number of units and the combined reference value where applicable.

Do older R112 approvals remain valid?

An existing R112 approval does not automatically lapse simply because R149 has been introduced. Whether a specific older approval can still be used or accepted depends on the applicable transitional and authorisation rules, the function and the vehicle application. You should therefore check the relevant documents.

TRALERT® assists with the selection of approved lighting

When choosing an LED driving light or LED bar , you should consider not only light output and beam pattern, but also the approved function and installation options. As a specialist B2B lighting partner, TRALERT® supports vehicle manufacturers, dealers and other professional customers in selecting suitable solutions.

Take a look at our LED headlights or the categories mentioned above for driving lights and LED bars. Check the approvals listed for each model and, in the case of complex vehicle configurations, please contact us for advice on suitability.

Download official sources and ECE R149

• UNECE – UN Regulation No. 149 (official document page).
• UNECE – R149 Revision 1, Amendment 3.
• UN Convention registration – official status of R149.

When fitting to a specific vehicle, the applicable installation regulations and the approval status of the chosen product remain decisive.