One of the most frequent questions engineers ask before inspecting Lux / Lighting Verification Report is: "Which standard should I cite on the certificate, and where do the pass/fail limits come from?" This reference guide maps EN 12464-1:2021 / EN 15193 to national regulatory adoptions and provides the complete standard annex tables.
1. National & Regional Standard Equivalence Matrix
| Region / Language | Adopted National Standard & Regulatory Code |
|---|---|
| International / UK (EN) | EN 12464-1:2021 / EN 15193 |
| Turkey (TR · Türkçe) | TS EN 12464-1:2021 / İSG Aydınlatma Yönetmeliği |
| Germany / DACH (DE · Deutsch) | DIN EN 12464-1:2021 / ASR A3.4 |
| France (FR · Français) | NF EN 12464-1:2021 / Code du Travail R4223 |
| Spain (ES · Español) | UNE-EN 12464-1:2021 / RD 486/1997 |
| Italy (IT · Italiano) | UNI EN 12464-1:2021 / D.Lgs 81/08 |
| Gulf / Middle East (AR · العربية) | EN 12464-1:2021 / EN 15193 / SASO / DEWA / ADDC |
2. Normative Acceptance Criteria & Mathematical Basis
Select the EN 12464-1:2021 space category (or click a preset in the Standard Annex drawer above) to automatically set the required maintained illuminance Em, uniformity U0 = Emin / Eavg, glare limit UGR_L, and CRI Ra. Enter room dimensions L, W, Hm to verify the mandatory EN 12464-1 §4.4.1 measurement grid point count from Room Index K.
Uo: Uo = Emin / Eavg — Illuminance uniformity on the task area; must meet the space class limit (0.40, 0.60, or 0.70) and cannot exceed 1.00.
K (Room Index): K = (L x W) / (Hm x (L + W)) — Determines minimum number of lux grid measurement points N_min (4, 9, 16, or 25 points) per EN 12464-1 §4.4.1.
LPD: LPD = P_total / (L x W) [W/m2] — Installed Lighting Power Density and normalized efficiency W/m2 per 100 lx (EN 15193-1).
3. Official Standard Reference Tables
EN 12464-1:2021 Normative Indoor Workplace Illuminance Schedule (EN 12464-1:2021 Section 5 & ANSI/TIA-942)
| Ref Clause | Zone / Activity / Room Type | Maintained Em (Lux) | Min Uniformity Uo | Max Glare R_UGL | Min CRI Ra |
|---|---|---|---|---|---|
| 5.1.1 | Corridors and circulation areas | 100 lx | 0.40 | 28 | 40 |
| 5.1.2 | Stairs, escalators, loading ramps | 150 lx | 0.40 | 25 | 40 |
| 5.25.2 | Electrical switchrooms, plant & generator rooms | 200 lx | 0.40 | 25 | 60 |
| 5.25.4 | Control rooms & switchboard control desks | 500 lx | 0.60 | 19 | 80 |
| 5.26.1 | Filing, copying, reception counter | 300 lx | 0.40 | 19 | 80 |
| 5.26.2 | Writing, typing, reading, VDT office workstations | 500 lx | 0.60 | 19 | 80 |
| 5.26.3 | Technical drawing / CAD design stations | 750 lx | 0.70 | 16 | 80 |
| 5.26.4 | Conference and meeting rooms | 500 lx | 0.60 | 19 | 80 |
| 5.29.1 | Store rooms, cold stores, bulk warehouse aisles | 100 - 200 lx | 0.40 | 25 | 60 |
| 5.10.2 | Rough mechanical / electrical assembly (cables, transformers) | 300 lx | 0.60 | 25 | 80 |
| 5.10.4 | Fine electrical assembly (control panels, switchgear wiring) | 750 lx | 0.70 | 16 | 80 |
| 5.10.5 | Precision electronic workshops, PCB inspection | 1000 lx | 0.70 | 16 | 90 |
| TIA-942 | Data center server hall (1 m above floor in aisle) | 500 lx | 0.60 | 19 | 80 |
Minimum Illuminance Measurement Grid Points by Room Index K (EN 12464-1 §4.4.1) (EN 12464-1:2021 §4.4.1)
| Room Index K = L·W / [Hm·(L+W)] | Min Grid Layout | Min Number of Measurement Points |
|---|---|---|
| K < 1.0 | 2 x 2 symmetrical grid | 4 points minimum |
| 1.0 <= K < 2.0 | 3 x 3 symmetrical grid | 9 points minimum |
| 2.0 <= K < 3.0 | 4 x 4 symmetrical grid | 16 points minimum |
| K >= 3.0 | 5 x 5 symmetrical grid | 25 points minimum |
Note: Exclude a 0.5 m border strip from walls unless the task area extends to the wall.