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DIN EN 12464-1 – Workplace Lighting

What does DIN EN 12464-1 require for lighting?

DIN EN 12464-1 "Light and Lighting – Lighting of Work Places – Part 1: Indoor Work Places" is the central standard for workplace lighting design in Europe. It defines minimum requirements for illuminance (Lux), glare limitation (UGR), colour rendering (CRI) and uniformity for over 250 different room types and activities. The current 2021 edition tightens requirements compared to the previous version and is considered a recognised rule of technology. For electricians, it is binding for workplaces.

Key Lux Values by Room Type

Office, writing, reading, screen work: 500 Lux, UGR≤19, CRI≥80. Technical drawing, CAD: 750 Lux, UGR≤16, CRI≥80. Reception: 300 Lux, UGR≤22, CRI≥80. Conference rooms: 500 Lux, UGR≤19, CRI≥80. Retail: 300 Lux, UGR≤22, CRI≥80. Workshops, assembly (rough): 300 Lux, UGR≤25, CRI≥80. Workshops, assembly (fine): 500 Lux, UGR≤22, CRI≥80. Quality control: 750-1000 Lux, UGR≤16, CRI≥90. Warehouses, logistics: 200 Lux, UGR≤25, CRI≥60. Corridors, stairwells: 100 Lux, UGR≤25, CRI≥40. Parking garages: 75 Lux, UGR≤25, CRI≥40. Kitchens (commercial): 500 Lux, UGR≤22, CRI≥80. Training rooms: 500 Lux, UGR≤19, CRI≥80.

What Does "Maintained Illuminance" Mean?

The Lux values in DIN EN 12464-1 are maintained values (Em). This means: illuminance must never fall below this value – not even after years of use. Since luminaires get dirty over time and LEDs have some lumen depreciation, a maintenance factor (MF) must be considered during planning. Typical maintenance factors: Clean office environment: MF 0.8. Normal industrial environment: MF 0.7. Dusty/dirty environment: MF 0.6. This means: For 500 Lux maintained at MF 0.8, you must achieve 625 Lux at new installation (500 / 0.8). High-quality LED luminaires with L80/B10 at 50,000h have lower lumen depreciation than budget products, improving the maintenance factor.

Checklist: Standard-Compliant Lighting Design

1. Identify room type and activity → Read Lux value, UGR limit and CRI from standard. 2. Define maintenance factor (depends on contamination and cleaning interval). 3. Survey room geometry: area, height, reflectances (ceiling/wall/floor). 4. Luminaire selection: Check luminous flux, light distribution, UGR table value, CRI. 5. Calculation: Number of luminaires = (Lux × Area) / (Luminous flux × Utilisation factor × Maintenance factor). 6. Check uniformity: Uo ≥ 0.6 on task area, Uo ≥ 0.4 in surrounding area. 7. Consider emergency lighting per DIN EN 1838 (if required). 8. Create documentation: Light calculation (DIALux/RELUX), luminaire layout, maintenance plan.

Related Products

Office Lighting →LED Panels →

FAQ

Is DIN EN 12464-1 legally binding?+

DIN standards are not directly legally binding but are considered "recognised rules of technology". The Workplace Ordinance (ArbStättV) and Technical Rule ASR A3.4 reference DIN EN 12464-1. In practice this means: Anyone deviating must prove an equivalent level of protection. In accidents or disputes, the standard is used as benchmark.

How many Lux does a workshop need?+

It depends on the activity. Rough assembly: 300 Lux. Medium assembly/machine work: 500 Lux. Precision mechanics, electronics manufacturing: 750 Lux. Quality inspection of fine details: 1000 Lux. Additionally, higher illuminance at individual workstations via task lights is advisable.

What changed in the 2021 edition?+

Key changes: Stronger emphasis on non-visual effects of light (melanopic effect). New recommendations for daylight integration and dynamic lighting. Adjusted uniformity requirements. Addition of cylindrical illuminance (Ez) for facial recognition in communication areas. The basic values for Lux, UGR and CRI have largely remained the same.

Do I need a light calculation for every installation?+

Formally, the standard does not require proof of calculation. In practice, however, many clients, architects and authorities demand a DIALux or RELUX calculation. For standard rooms (offices, corridors) with proven luminaire arrangements, a simplified calculation using the lumen method may suffice. For complex room geometries or special requirements, software calculation is recommended.

Does DIN EN 12464-1 apply to LED lighting too?+

Yes, the standard is technology-neutral. It defines requirements for the result (Lux, UGR, CRI), not the light source. LED luminaires must meet the same limits as conventional luminaires. The advantage of LEDs: They typically achieve better UGR values, higher CRI values and lower maintenance factors than fluorescent lamps.

Related Articles

UGR – Glare Rating for Luminaires

What is the UGR value? Glare rating per DIN EN 12464-1 explained. UGR<19 for offices, UGR<22 for industry. Table, calculation and practical tips for electricians.

Lux – Planning Illuminance Correctly

How many Lux for an office, workshop, warehouse? Lux table per DIN EN 12464-1, calculation formula and practical examples for electricians.

CRI – Colour Rendering for LED Luminaires

What does CRI mean for LED? Colour Rendering Index Ra explained: CRI 80 vs 90 vs 95. Which CRI for office, retail, industry? Practical tips for electricians.

DIN EN 12464-1: Workplace Lighting Explained | VYSN Lighting