LED Street Light Standards Explained: IEC, EN, IP, IK, EMC and Photometric Requirements

Photometric Requirements for LED Street Lights

For road lighting, electrical safety is only one part of the engineering problem.

The primary purpose of a street light is to provide appropriate illumination for the intended road and users.

This is why photometric performance is essential.

Photometric evaluation can include:

• Luminous flux

• Light intensity distribution

• Luminous intensity

• Beam distribution

• Illuminance

• Luminance

• Uniformity

• Glare-related parameters

• Lighting-class performance

Why Lumens Alone Are Not Enough

A common supplier specification is:

150 lm/W

or:

24,000 lumens

These numbers may be useful, but they do not tell the buyer how light is distributed across the road.

Two luminaires can have similar total luminous flux but produce very different road lighting results.

For example:

Luminaire A

Produces high total luminous flux but concentrates too much light in unsuitable directions.

Luminaire B

Produces a similar total flux but uses an optical distribution better suited to the road geometry.

The second product may produce better project-level lighting performance.

Therefore:

Total lumens ≠ road lighting performance.

Photometric Data and Road Lighting Design

Professional road lighting design requires more than a product lumen figure.

Depending on the project, engineers may need:

• Photometric test data

• IES or LDT files

• Luminaire mounting height

• Road width

• Pole spacing

• Setback

• Tilt angle

• Road classification

• Required illuminance or luminance

• Uniformity requirements

CIE 115:2010 provides recommendations for lighting roads for motor and pedestrian traffic and describes a structured approach to selecting appropriate lighting classes.

This is why a street light should be evaluated as part of a lighting system, not merely as a standalone electrical product.

Photometric Files: IES and LDT

For engineering design, digital photometric files are particularly useful.

Common formats include:

• IES

• LDT

These files can be imported into lighting calculation software.

They allow engineers to model:

• Pole spacing

• Mounting height

• Road width

• Light distribution

• Illuminance

• Uniformity

The exact software and calculation method depend on the project.

The important principle is:

A street light should be selected based on the required road lighting result, not only its catalogue lumen value.

Photobiological Safety

Another area that should not be confused with road-lighting photometry is photobiological safety.

IEC 62471 provides guidance for evaluating photobiological safety of lamps and lamp systems, including luminaires, and addresses optical radiation hazards across the specified wavelength range.

This is a different engineering question from:

“Does this luminaire provide sufficient road illumination?”

Photobiological safety concerns potential optical radiation hazards.

Road lighting design concerns whether the lighting system provides the required visual conditions.

Both can matter, but they should not be treated as the same test.

Why IP, IK, EMC and Photometric Tests Cannot Replace Each Other

The easiest way to understand the standards framework is to look at the question each test answers.

This table illustrates a fundamental engineering principle:

No single test proves complete product suitability.

How Standards, Test Reports and Project Specifications Work Together

A professional procurement process can be represented as:

International / Regional Standard

↓

Applicable Test Method

↓

Laboratory Test

↓

Technical Evidence

↓

Product Configuration

↓

Project Specification

↓

Engineering Approval

Each layer has a different role.

Standards Define the Framework

Standards provide:

• Definitions

• Test methods

• Classification systems

• Technical requirements

• Measurement procedures

They create a common technical language.

Test Reports Provide Evidence

A test report records what was tested and what results were obtained under defined conditions.

A good report should allow the buyer to identify:

• Product

• Model

• Test method

• Standard

• Test conditions

• Results

• Laboratory

This is why A03 is important: the buyer must verify that the report actually represents the product being purchased.

Project Specifications Define What Is Required

A standard does not automatically tell a buyer what performance level is appropriate for every road.

The project may specify:

• Minimum IP rating

• Minimum IK rating

• EMC requirements

• Road lighting class

• Illuminance

• Luminance

• Uniformity

• Glare limitations

• Environmental requirements

Therefore:

Standards establish technical frameworks; project specifications establish the actual acceptance criteria.

How to Select the Right Standards for an LED Street Light Project

There is no technically responsible way to create one universal checklist for every international street lighting project.

A better process is to follow six steps.

Step 1 — Identify the Destination Market

Determine:

• Country

• Region

• Applicable regulations

• National standards

• Required conformity assessment

European projects, for example, may reference European standards and European regulatory requirements.

Other markets may use IEC standards together with national requirements.

Step 2 — Identify the Project Specification

Read the project documents before requesting certificates.

Look for:

• Luminaire standard

• IP requirement

• IK requirement

• EMC requirement

• Photometric requirements

• Environmental requirements

• Driver requirements

• Surge protection requirements

Step 3 — Identify the Applicable Product Standards

Determine which standards apply to the particular luminaire.

For road lighting, IEC 60598-2-3 may be relevant together with the applicable general luminaire requirements.

The exact edition and conformity route should be verified against the project and market.

Step 4 — Identify Environmental Requirements

Consider:

• Rain

• Dust

• Coastal atmosphere

• Salt exposure

• Temperature

• Humidity

• Mechanical impact

• Installation altitude where relevant

The appropriate requirements depend on the actual site.

Step 5 — Identify Photometric Requirements

Determine:

• Road classification

• Required lighting class

• Mounting height

• Road width

• Pole spacing

• Required illuminance or luminance

• Uniformity

• Glare criteria

Then request appropriate photometric data.

Step 6 — Build a Document Matrix

Instead of collecting random certificates, build a project-specific matrix.

This approach is much more useful than simply asking a supplier:

“Please send all certificates.”

LED Street Light Standards Procurement Checklist

Before approving an LED street light, the buyer can use the following checklist.

Product Identification

• Exact model number identified

• Rated power confirmed

• Input voltage confirmed

• Frequency confirmed

• Driver identified

• LED configuration identified

• Optical configuration identified

Luminaire Safety

• Applicable IEC/EN luminaire standard identified

• Relevant test report available

• Tested model matches supplied model

• Applicable standard edition checked

• Report is complete and traceable

IP Protection

• Required IP level defined

• Test standard identified

• Test report available

• Tested product matches production product

IK Protection

• Required IK level defined

• IEC 62262 or applicable equivalent identified

• Test evidence available where required

• Product configuration verified

EMC

• Applicable emission requirements identified

• Applicable immunity requirements identified

• Relevant EMC reports available

• Product configuration verified

Photometric Performance

• Photometric report available

• Luminous flux verified

• Light distribution verified

• IES/LDT file available where required

• Road lighting calculation completed

• Required uniformity verified

• Glare requirements considered

Project Compliance

• Destination-market requirements reviewed

• Project specification reviewed

• Required standards mapped

• Required certificates and reports identified

• Product configuration frozen before approval

Common Mistakes When Interpreting LED Street Light Standards

Mistake 1 — Treating CE as a Single Test

CE marking should not be understood as one universal laboratory test for every aspect of an LED street light.

The applicable European regulatory requirements and conformity assessment route need to be identified for the specific product.

Supporting technical documentation may include:

• Declaration of Conformity

• Test reports

• Technical documentation

• Applicable standards

Therefore:

“CE available” is not a substitute for reviewing the underlying compliance evidence.

Mistake 2 — Assuming IP66 Means Complete Waterproofing

IP66 is a classification under IEC 60529.

It does not mean:

• The luminaire can be submerged indefinitely

• Installation quality is irrelevant

• Gaskets cannot age

• Water can never enter after years of service

The rating describes performance under defined test conditions.

Mistake 3 — Using IK to Judge Electrical Safety

IK evaluates external mechanical impact protection.

It does not establish electrical safety.

Therefore:

IK08 is not an electrical safety rating.

Mistake 4 — Assuming EMC Proves Lighting Performance

EMC testing and photometric testing answer different questions.

An EMC-compliant luminaire can still have:

• Poor optical distribution

• Excessive glare

• Insufficient uniformity

• Unsuitable road lighting performance

Mistake 5 — Selecting a Street Light Based Only on Lumens

High lumen output does not automatically mean good road lighting.

The actual result depends on:

• Optical distribution

• Mounting geometry

• Road width

• Pole spacing

• Mounting height

• Road lighting requirements

Mistake 6 — Ignoring the Project Specification

A product can comply with a relevant international standard and still fail a particular project requirement.

For example:

The project may require a specific:

• IP level

• IK level

• Lighting class

• Uniformity

• Glare criterion

Compliance must therefore be evaluated against the actual project specification.

Mistake 7 — Treating an Old Test Report as Automatically Valid for a New Product

A report is evidence for the configuration that was tested.

If the supplier later changes:

• Driver

• LED module

• Lens

• Housing

• Surge protection

• Internal electrical design

the applicability of the original report should be reviewed.

This is especially important when the supplier offers multiple generations of the same product family.

Mistake 8 — Collecting Certificates Without Building an Evidence Chain

A procurement file containing twenty certificates can still be technically weak if nobody knows which certificate proves which requirement.

A better approach is:

Requirement → Standard → Test → Report → Product Model

This creates traceability.

How Professional Buyers Evaluate an LED Street Light

The strongest procurement process combines several types of evidence.

Layer 1 — Product Identity

Confirm exactly what is being purchased.

Layer 2 — Standards

Identify which technical standards apply.

Layer 3 — Laboratory Evidence

Review the relevant test reports.

Layer 4 — Product Configuration

Confirm that tested components match production.

Layer 5 — Photometric Design

Confirm that the luminaire works for the actual road geometry.

Layer 6 — Project Acceptance

Compare the complete evidence package against the project specification.

This is a much stronger process than selecting a product based on:

Wattage + lumens + IP rating + price.

What Should Buyers Request From an LED Street Light Supplier?

For a professional project, the documentation package may include:

Product Documents

• Product datasheet

• Technical drawing

• Installation manual

• Product photographs

• Driver information

Compliance Documents

• Luminaire safety test report

• EMC test report

• IP test report

• IK test report where required

• Applicable declarations or certificates

Photometric Documents

• Photometric test report

• IES file

• LDT file

• Lighting calculation where applicable

Project Documents

• Warranty information

• Quality documentation

• Inspection documentation

• Relevant environmental test evidence

Not every project requires every document.

The correct document list should be derived from the project’s actual technical requirements.

A Practical Standard-Mapping Example

Suppose an EPC contractor is evaluating an LED street light for a public-road project.

The procurement team receives the following supplier information:

• 150 W

• IP66

• IK08

• CE

• EMC tested

• 24,000 lm

This is not yet a complete technical approval.

The engineer should convert the information into questions.

Safety

What applicable luminaire safety standard was used?

IP

Is IP66 supported by a traceable test report for the exact model?

IK

Is IK08 supported by appropriate test evidence?

EMC

Which emission and immunity requirements were evaluated?

Photometry

Where is the photometric distribution?

Road Lighting

Does the luminaire meet the project’s required road lighting criteria?

This transforms marketing information into an engineering evaluation.

The Difference Between Product Compliance and Project Suitability

This distinction is extremely important.

Product Compliance

Asks:

Does the product meet the applicable technical or regulatory requirements demonstrated by the relevant evidence?

Project Suitability

Asks:

Is this particular product appropriate for this particular application?

The second question is broader.

A compliant luminaire may still be unsuitable if:

• Optical distribution is wrong

• Mounting arrangement is unsuitable

• Environmental conditions exceed the design assumptions

• Required road lighting class cannot be achieved

• Project-specific specifications are not satisfied

Therefore:

Compliance is necessary, but project suitability requires engineering evaluation.

Why Standards, Testing and Engineering Design Must Be Connected

A professional street lighting decision can be summarized as:

Standards define the technical framework.

Testing demonstrates defined characteristics under defined conditions.

Product documentation identifies the actual configuration.

Photometric design determines whether the light distribution works for the road.

Project specifications determine the acceptance criteria.

This is the correct relationship between standards and procurement.

Frequently Asked Questions

What standards apply to LED street lights?

The applicable standards depend on the market, product design, project specification, and regulatory requirements.

For road and street lighting luminaires, the IEC 60598 family is an important reference. Other requirements may cover IP, IK, EMC, photobiological safety, and photometric performance.

What is IEC 60598?

IEC 60598 is a family of standards for luminaires.

IEC 60598-1 provides general requirements and tests for luminaires, while IEC 60598-2-3 addresses particular requirements for road and street lighting luminaires.

What is the difference between IEC and EN?

IEC standards are international standards developed by the International Electrotechnical Commission.

EN standards are European Standards.

A particular EN standard may adopt an IEC standard, but the relationship and applicable edition should be checked for the specific document rather than assuming that every EN and IEC reference is identical.

What does IP66 mean for an LED street light?

IP66 is an enclosure protection classification under IEC 60529.

The first digit concerns protection against access and solid foreign objects, while the second digit concerns water protection.

It should be interpreted according to the test conditions and requirements of IEC 60529, rather than simply translated as “fully waterproof.”

What does IK08 mean?

IK08 is an IK Code classification related to protection provided by an enclosure against external mechanical impacts.

The classification is defined by IEC 62262. The applicable impact level should be interpreted according to the relevant edition and test requirements.

What is EMC testing for LED street lights?

EMC testing evaluates electromagnetic compatibility characteristics within the applicable test scope.

For lighting equipment, CISPR 15 addresses radio-frequency disturbance emissions, while IEC 61547 addresses electromagnetic immunity requirements for lighting equipment.

Is CE certification enough for an LED street light?

No single CE document should be treated as proof of every aspect of an LED street light’s technical performance.

The applicable European requirements and conformity assessment route should be identified, and the supporting technical evidence should be reviewed.

Are photometric tests required for road lighting?

For professional road lighting design, reliable photometric data is fundamental because the engineer needs to understand how the luminaire distributes light.

The exact testing and documentation requirements depend on the project specification and applicable standards.

What is the difference between IP and IK?

IP addresses enclosure protection against ingress and access under the IP Code.

IK addresses enclosure protection against external mechanical impacts.

They evaluate different characteristics and cannot replace one another.

Which LED street light standards should buyers request from suppliers?

The correct list depends on the project.

A typical technical review may include:

• Applicable luminaire safety standards

• IP requirements

• IK requirements where specified

• EMC requirements

• Photometric data

• Applicable environmental testing

• Market-specific conformity documentation

The buyer should map each project requirement to a specific piece of evidence.

Does an IEC test report prove that an LED street light is suitable for a road project?

Not by itself.

A test report provides evidence for the characteristics and configuration covered by the test.

Project suitability also depends on:

• Road geometry

• Lighting class

• Optical distribution

• Installation conditions

• Environmental requirements

• Project specifications

Final Engineering Checklist

Before approving an LED street light for an international project, ask:

Standards

• What standards apply?

• Which editions are referenced?

• Are the standards appropriate for the destination market?

Safety

• Is the applicable luminaire safety evidence available?

• Does the tested model match the supplied model?

IP

• What IP level is required?

• Is the rating supported by a test report?

IK

• Is impact protection required?

• Is the claimed IK level supported by appropriate evidence?

EMC

• Are applicable emission requirements covered?

• Are applicable immunity requirements covered?

Photometry

• Is complete photometric data available?

• Is the optical distribution appropriate?

• Is an IES or LDT file available where required?

• Has the road lighting calculation been completed?

Product Configuration

• Does the tested driver match production?

• Does the LED configuration match?

• Does the optical system match?

• Does the housing match?

Project

• Does the complete product meet the project specification?

• Has the evidence chain been reviewed?

Conclusion: Standards Are the Framework, Not the Final Answer

LED street light procurement becomes much more reliable when standards are treated as an engineering framework rather than a collection of marketing labels.

IEC 60598 helps establish luminaire safety requirements.

IEC 60598-2-3 addresses particular requirements for road and street lighting luminaires.

IEC 60529 defines the IP Code for enclosure protection.

IEC 62262 defines the IK Code for external mechanical impact protection.

CISPR 15 and IEC 61547 address important EMC aspects for lighting equipment.

Photometric testing and road-lighting design determine how effectively the luminaire performs its actual lighting function.

Each answers a different question.

The most important procurement principle is therefore:

There is no single standard, certificate, or rating that proves an LED street light is suitable for every project.

A professional evaluation connects:

Project Requirement

↓

Applicable Standard

↓

Test Method

↓

Laboratory Evidence

↓

Product Configuration

↓

Photometric Design

↓

Project Approval

This approach allows buyers, EPC contractors, lighting engineers, and project owners to evaluate LED street lights based on verifiable engineering evidence rather than relying only on supplier claims.

For international projects, the goal should not be to collect the largest number of certificates.

The goal should be to establish a clear, traceable, and technically relevant evidence chain showing that the proposed luminaire satisfies the requirements of the actual project.

Need LED Street Light Technical Documentation for Your Project?

Yilong provides LED street lighting solutions supported by technical documentation and project-oriented engineering information.

For project evaluation, customers can request relevant product specifications, laboratory documentation, photometric data, and technical support.

Contact Yilong to discuss your LED street lighting project requirements.