EN 12464-1
Standard
Light and Lighting — Lighting of Work Places
Application area
Interior workplace lighting
Project relevance
Maintained illuminance, glare limits and lighting quality requirements for indoor workplaces.
Electrical engineering
Power and lighting design for visual quality and efficiency
Lighting layouts, luminaire specifications, circuit design and emergency lighting systems developed from illuminance targets through detailed documentation and commissioning verification.
Service scope
Power and lighting design at SEINZEN addresses the full scope from lighting concept and illuminance analysis through circuit design, panel schedules and emergency lighting provision. Design begins with space function analysis, maintained illuminance targets and energy performance requirements aligned to EN 12464, IES or project-specific criteria.
Luminaire selection considers photometric performance, colour rendering, glare control and maintenance access with layouts coordinated against ceiling grids, architectural features and MEP services. Daylight integration and lighting control strategies are developed to reduce energy consumption while maintaining visual comfort.
Power distribution for lighting circuits is designed with load balancing, voltage drop verification and protective device coordination. Emergency and escape lighting systems are specified per applicable life safety codes with duration, lux levels and testing requirements defined.
Documentation includes Revit lighting models, calculation reports, panel schedules and specifications issued at defined milestones with commissioning lux verification support through handover.
Key engineering capabilities
Illuminance and luminance analysis
Maintained illuminance calculations using lumen method and point-by-point analysis for uniform and task-specific lighting.
Interior lighting design
Office, retail, hospitality and healthcare lighting layouts with luminaire selection and mounting coordination.
Exterior and facade lighting
Site, facade, landscape and car park lighting with light pollution control and energy management.
Emergency and escape lighting
Self-contained and central battery systems designed to BS 5266, EN 1838 or NFPA 101 requirements.
Lighting control systems
DALI, KNX and BMS-integrated control with occupancy sensing, daylight linking and scene setting.
Daylight integration
Daylight factor analysis and photosensor control strategies to optimise artificial lighting energy use.
Power circuit design
Lighting panel schedules, circuit loading and cable sizing with load balancing across phases.
Energy compliance
Lighting power density verification against ASHRAE 90.1, EN 15193 and project certification requirements.
Specialist lighting
Museum, gallery, sports and healthcare examination lighting with precise photometric requirements.
Design and delivery methodology
- 01
Design criteria establishment
Illuminance targets, uniformity ratios, glare limits and energy benchmarks defined per space type and client brief.
- 02
Concept and layout
Preliminary luminaire layouts and lighting concepts coordinated with architectural ceiling and feature designs.
- 03
Calculation and selection
Illuminance calculations, luminaire specifications and control zoning prepared for design team review.
- 04
Detailed design
Circuit drawings, panel schedules, emergency lighting layouts and Revit models issued to construction standard.
- 05
Coordination and issue
Ceiling coordination, MEP clash resolution and specification issue for tender.
- 06
Commissioning verification
On-site lux measurement, emergency duration testing and control system functional verification.
Technical design criteria
Maintained illuminance levels
Target lux levels for task, circulation and ambient lighting per EN 12464-1 space type classifications.
Uniformity and glare control
U0 uniformity ratios and UGR limits applied to prevent visual discomfort in office and screen-based tasks.
Colour rendering and temperature
CRI and correlated colour temperature selection for retail, healthcare and hospitality visual requirements.
Lighting power density
Installed power per unit area verified against code maximums and certification target allowances.
Emergency lighting lux levels
Escape route, open area and high-risk task area illuminance per life safety code requirements.
Luminaire photometric data
IES and LDT file application for calculation accuracy with manufacturer verified photometry.
Control zoning and dimming
Zone definitions aligned to occupancy patterns, daylight availability and operational schedules.
Exterior lighting standards
Road, car park and facade lighting per EN 13201 and dark-sky compliance where applicable.
Circadian and wellbeing lighting
Melanopic equivalent daylight illuminance and tunable white strategies for workplace wellbeing projects.
Sports and arena lighting
Horizontal and vertical illuminance, flicker index and TV broadcast compatibility for sports facilities.
Engineering principles and calculation approaches
E = (N × Φ × UF × MF) / A
Variables
E = maintained illuminance (lux); N = number of luminaires; Φ = luminous flux per luminaire (lm); UF = utilisation factor; MF = maintenance factor; A = room area (m²)
Application
Average illuminance estimation using the lumen method for preliminary layout sizing.
Notes
UF derived from room index and reflectance; MF typically 0.7–0.8 depending on environment and maintenance interval.
RI = (L × W) / (H × (L + W))
Variables
RI = room index; L = room length (m); W = room width (m); H = mounting height (m)
Application
Room index calculation for utilisation factor lookup in lumen method analysis.
Notes
Mounting height measured from luminaire plane to working plane.
LPD = P_total / A
Variables
LPD = lighting power density (W/m²); P_total = total installed lighting power (W); A = floor area (m²)
Application
Lighting power density verification against code maximums and certification targets.
Notes
Include all permanently installed lighting; exclude emergency-only luminaires where code permits.
UGR = 8 × log10(0.25/Lb × Σ(L² × ω / p²))
Variables
UGR = unified glare rating; Lb = background luminance (cd/m²); L = luminance of luminous parts; ω = solid angle; p = position index
Application
Glare assessment for office and screen-based task environments per CIE 117.
Notes
Calculated using luminaire photometric data and observer position; target UGR ≤ 19 for office tasks.
I = E × A / (t × η)
Variables
I = luminous intensity required (cd); E = illuminance (lux); A = surface area (m²); t = transmittance; η = lamp efficacy (lm/W)
Application
Floodlight and exterior luminaire quantity estimation for area lighting.
Notes
Apply maintenance factor and lamp lumen depreciation for maintained performance.
Final design values must be determined using project-specific inputs, applicable standards, manufacturer data and engineering judgement.
BIM, Revit and integrated design
Lighting fixtures are modelled in Revit with luminaire families, mounting heights and circuit assignments at defined LOD for coordination.
Lighting calculation results are referenced to model spaces with illuminance targets documented in room data sheets.
Ceiling-mounted luminaires are coordinated with HVAC diffusers, sprinklers and access panels through federated clash detection.
Panel schedules and circuit data are linked to model elements for consistent tagging across drawings and schedules.
International standards and codes
EN 12464-2
Standard
Light and Lighting — Outdoor Work Places
Application area
Exterior workplace lighting
Project relevance
Illuminance requirements for outdoor working areas and construction sites.
EN 1838
Standard
Lighting Applications — Emergency Lighting
Application area
Emergency lighting design
Project relevance
Escape route, anti-panic and high-risk task area emergency lighting requirements.
BS 5266-1
Standard
Emergency Lighting — Code of Practice
Application area
UK emergency lighting
Project relevance
Design, installation and testing requirements for emergency lighting in UK projects.
IES Lighting Handbook
Standard
Illuminating Engineering Society Reference
Application area
Lighting design reference
Project relevance
Calculation methods, recommended practice and application guidance for lighting design.
CIE 117
Standard
Discomfort Glare in Interior Lighting
Application area
Glare assessment
Project relevance
UGR calculation methodology and limits for visual comfort evaluation.
ASHRAE 90.1
Standard
Energy Standard for Buildings
Application area
Lighting power compliance
Project relevance
Lighting power density limits and control requirements for energy code compliance.
EN 15193
Standard
Energy Performance of Buildings — Energy Requirements for Lighting
Application area
European lighting energy
Project relevance
Energy performance calculation methodology for building lighting systems.
EN 13201
Standard
Road Lighting
Application area
Exterior road and car park lighting
Project relevance
Illuminance and uniformity requirements for vehicular and pedestrian areas.
NFPA 101
Standard
Life Safety Code
Application area
US emergency lighting
Project relevance
Emergency lighting duration and illuminance for US jurisdiction projects.
IEC 60598
Standard
Luminaires — General Requirements and Tests
Application area
Luminaire specification
Project relevance
Safety, performance and classification requirements for luminaire selection.
DALI-2 / IEC 62386
Standard
Digital Addressable Lighting Interface
Application area
Lighting control
Project relevance
Open protocol requirements for addressable lighting control systems.
| Code | Standard | Application area | Project relevance |
|---|---|---|---|
| EN 12464-1 | Light and Lighting — Lighting of Work Places | Interior workplace lighting | Maintained illuminance, glare limits and lighting quality requirements for indoor workplaces. |
| EN 12464-2 | Light and Lighting — Outdoor Work Places | Exterior workplace lighting | Illuminance requirements for outdoor working areas and construction sites. |
| EN 1838 | Lighting Applications — Emergency Lighting | Emergency lighting design | Escape route, anti-panic and high-risk task area emergency lighting requirements. |
| BS 5266-1 | Emergency Lighting — Code of Practice | UK emergency lighting | Design, installation and testing requirements for emergency lighting in UK projects. |
| IES Lighting Handbook | Illuminating Engineering Society Reference | Lighting design reference | Calculation methods, recommended practice and application guidance for lighting design. |
| CIE 117 | Discomfort Glare in Interior Lighting | Glare assessment | UGR calculation methodology and limits for visual comfort evaluation. |
| ASHRAE 90.1 | Energy Standard for Buildings | Lighting power compliance | Lighting power density limits and control requirements for energy code compliance. |
| EN 15193 | Energy Performance of Buildings — Energy Requirements for Lighting | European lighting energy | Energy performance calculation methodology for building lighting systems. |
| EN 13201 | Road Lighting | Exterior road and car park lighting | Illuminance and uniformity requirements for vehicular and pedestrian areas. |
| NFPA 101 | Life Safety Code | US emergency lighting | Emergency lighting duration and illuminance for US jurisdiction projects. |
| IEC 60598 | Luminaires — General Requirements and Tests | Luminaire specification | Safety, performance and classification requirements for luminaire selection. |
| DALI-2 / IEC 62386 | Digital Addressable Lighting Interface | Lighting control | Open protocol requirements for addressable lighting control systems. |
Applicable standards depend on the project location, building use, authority having jurisdiction, employer requirements and contract documents. The current adopted edition must be confirmed at the beginning of each project.
Project deliverables and documentation
Lighting design report
Design criteria, calculation methodology and results summary for all space types.
Illuminance calculation reports
Maintained lux levels, uniformity ratios and glare assessment per space.
Lighting layout drawings
Floor plan layouts with luminaire locations, types and circuit references.
Luminaire schedule
Specification data including photometry, wattage, CRI, CCT and mounting details.
Emergency lighting drawings
Escape route, open area and external emergency lighting layouts.
Lighting panel schedules
Circuit loading, protective devices and phase balance for lighting distribution.
Lighting control schematic
Zone definitions, sensor locations and BMS integration points.
Revit lighting models
Coordinated lighting models with fixtures, panels and circuits at defined LOD.
Performance specifications
Technical specifications for luminaires, controls and emergency systems for tender.
Exterior lighting design
Site, facade and car park lighting layouts with pole schedules where applicable.
Energy compliance report
Lighting power density verification against code and certification requirements.
Commissioning lux verification
On-site measurement protocol and acceptance criteria for handover verification.
Quality control and verification
Illuminance calculations independently reviewed against design criteria before layout issue.
Luminaire photometric data verified from manufacturer IES/LDT files before specification.
Emergency lighting coverage checked against escape routes and open area requirements.
Lighting power density verified against applicable code and certification limits.
Ceiling coordination validated through federated clash detection with MEP services.
Commissioning lux measurements compared against design targets at handover.
Applicable project types
Commercial office fit-out and base-build with open-plan and cellular lighting strategies.
Retail and hospitality projects with accent, display and ambient lighting coordination.
Healthcare facilities with examination, ward and circulation lighting to clinical standards.
Educational buildings with classroom, laboratory and sports hall lighting requirements.
Museum and gallery projects with precise illuminance and UV control for exhibits.
Exterior and landscape projects with facade, site and car park lighting design.
Frequently asked questions
What illuminance levels are typically specified for office workspaces?
EN 12464-1 recommends 500 lux maintained illuminance for general office tasks with UGR ≤ 19 and uniformity ≥ 0.6. Task-specific areas such as technical drawing may require 750 lux. Targets are confirmed with client brief and space function analysis.
How is emergency lighting designed and tested?
Emergency lighting is designed to EN 1838 or BS 5266 with escape route, open area and high-risk task coverage. Duration, lux levels and testing intervals are specified per applicable life safety code. Functional testing is verified during commissioning.
What lighting control strategies reduce energy consumption?
Occupancy sensing, daylight linking, time scheduling and dimming are combined per space type. Control zoning aligns with operational patterns and certification requirements such as ASHRAE 90.1 mandatory control provisions.
How are luminaires coordinated with ceiling services?
Lighting layouts are developed alongside ceiling grid, HVAC diffuser and sprinkler head locations. Revit models are federated with MEP disciplines with clash detection resolving conflicts before construction issue.
Can daylight analysis inform artificial lighting design?
Daylight factor or climate-based daylight modelling informs photosensor placement and artificial lighting zoning. Spaces with adequate daylight receive reduced installed power with control strategies optimising combined performance.
Discuss power and lighting scope
Contact our electrical team to review lighting design criteria, luminaire selection or emergency lighting requirements for your project.