Standards

Illuminance criteria, compared

Maintained illuminance, glare, uniformity and colour rendering by space type — EN 12464-1:2021 alongside typical IES practice and Vietnamese TCVN 7114-1.

Bảng tra nhanh độ rọi duy trì (Ēm), giới hạn chói loá (UGR), độ đồng đều (Uo) và chỉ số hoàn màu (Ra) theo từng loại không gian. Cột EN là EN 12464-1:2021, cột VN là TCVN 7114-1:2008. Bấm vào số ở cột EN để copy. Đây là bảng định hướng nhanh — phải đối chiếu lại với bản tiêu chuẩn chính thức trước khi đưa vào hồ sơ.

Indicative values — verify before use. This table exists to orient you quickly, not to certify a design. The EN column reflects commonly cited EN 12464-1:2021 reference values; the IES column is indicative of typical North American practice rather than a single quoted figure; the VN column reflects TCVN 7114-1:2008. Confirm every number against the current purchased standard and the version your contract calls up. EN 12464-1:2021 also applies context modifiers and separate cylindrical, wall and ceiling illuminance requirements that a single number cannot express.

EN 12464-1:2021 tiers the requirement outward from the task rather than flooding the whole room. Pin the task locations down early — if they are unknown at design stage the entire room must be treated as task area, which is far more expensive to build and to run.

Lighting criteria by space type across EN 12464-1, IES practice and TCVN 7114-1
Space	UGR	Uo	Ra	IES (lx)	VN (lx)
Writing, typing, reading, data processing Viết, đánh máy, đọc, xử lý dữ liệu Offices · Văn phòng EN 12464-1:2021 also asks for cylindrical illuminance ≥150 lx and wall/ceiling illuminance ≥75/50 lx in the area.	≤19	0.60	≥80	300–500 (ambient + task)	500
CAD workstations Chỗ ngồi làm CAD Offices · Văn phòng Screen-reflection control matters more than the lux number; check luminaire luminance at 65°+.	≤19	0.60	≥80	300–500	500
Conference and meeting rooms Phòng họp, phòng hội thảo Offices · Văn phòng Must be dimmable for presentation scenes; add vertical illuminance for video calls.	≤19	0.60	≥80	300–500, dimmable	500
Reception desk Quầy lễ tân Offices · Văn phòng	≤22	0.60	≥80	300	300
Filing, copying, circulation Lưu trữ, photocopy, lối đi nội bộ Offices · Văn phòng	≤25	0.40	≥80	200–300	300
Corridors and traffic areas Hành lang và lối đi Circulation · Giao thông Raise toward the illuminance of adjoining spaces to avoid adaptation problems at the threshold.	≤28	0.40	≥40	50–100	100
Stairs, escalators, travelators Cầu thang, thang cuốn Circulation · Giao thông Model the tread nosings — flat, shadowless light on a stair is a genuine safety hazard.	≤25	0.40	≥40	100	150
Lift lobbies Sảnh thang máy Circulation · Giao thông	≤25	0.40	≥40	100–200	200
Canteens and tea rooms Căng tin, phòng trà Amenity · Phụ trợ	≤22	0.40	≥80	200–300	200
Toilets and washrooms Nhà vệ sinh, phòng rửa Amenity · Phụ trợ Vertical illuminance at the mirror is the real design driver, not the horizontal average.	≤25	0.40	≥80	100–200	200
Plant rooms and switch rooms Phòng kỹ thuật, phòng điện Amenity · Phụ trợ	≤25	0.40	≥60	200	200
Classrooms, general teaching Phòng học phổ thông Education · Giáo dục Evening-use classrooms are commonly designed to 500 lx.	≤19	0.60	≥80	300–500	300
Whiteboard / chalkboard Bảng viết, bảng phấn Education · Giáo dục Vertical plane, and specular reflection from the board toward seated students must be checked.	≤19	0.70	≥80	500 vertical	500
Lecture halls Giảng đường Education · Giáo dục	≤19	0.60	≥80	300–500, dimmable	500
Library — reading areas Thư viện — khu vực đọc Education · Giáo dục	≤19	0.60	≥80	300–500	500
Library — bookshelves Thư viện — kệ sách Education · Giáo dục Vertical plane on the spines; a horizontal-only calculation will pass and the shelves will still be dark.	≤19	0.60	≥80	200 vertical	200
Sales area (general) Khu bán hàng (chung) Retail · Bán lẻ EN gives a floor. Retail is designed on contrast ratios (feature:ambient typically 3:1 to 10:1), not on average lux.	≤22	0.40	≥80	300–1000 by segment	300
Till / checkout area Quầy thu ngân Retail · Bán lẻ	≤19	0.60	≥80	500	500
Fitting rooms Phòng thử đồ Retail · Bán lẻ High Ra and strong R9; vertical, soft and from the front. This detail sells clothes or loses them.	≤19	0.60	≥90	300–500	—
Hotel reception / concierge Lễ tân khách sạn, quầy concierge Hospitality · Khách sạn — nhà hàng Standards set the task minimum; the atmosphere is made in the layers around it.	≤22	0.60	≥80	200–300	300
Commercial kitchen Bếp công nghiệp Hospitality · Khách sạn — nhà hàng IP rating and cleanability usually dictate the fitting before photometrics do.	≤22	0.60	≥80	500	500
Restaurant dining Khu vực bàn ăn nhà hàng Hospitality · Khách sạn — nhà hàng Deliberately unregulated by EN 12464-1. Design to facial modelling and table luminance, and keep R9 high.	—	—	≥90 recommended	50–200, dimmable	—
Ward — general lighting Phòng bệnh — chiếu sáng chung Healthcare · Y tế Also needs reading (300 lx), examination (1000 lx) and night-watch (≤5 lx) scenes on separate control.	≤19	0.40	≥80	100–300	100
Examination and treatment Khám và điều trị Healthcare · Y tế Ra ≥ 90 with strong R9 is clinically relevant, not cosmetic — skin and tissue colour is diagnostic.	≤19	0.60	≥90	1000	1000
Ward corridor at night Hành lang khoa phòng ban đêm Healthcare · Y tế Keep melanopic content minimal — ≤2700 K and low mounting height, so staff and patients stay entrained.	≤22	0.40	≥80	50	50
Assembly — medium fine work Lắp ráp — công việc chính xác vừa Industrial · Công nghiệp	≤22	0.60	≥80	500	500
Inspection and colour checking Kiểm tra và soi màu Industrial · Công nghiệp Colour checking calls for a defined CCT (often 6500 K) as well as high Ra.	≤19	0.70	≥90	1000+	1000
Warehouse aisles (occupied) Lối đi kho hàng (khi có người) Industrial · Công nghiệp 20 lx when unoccupied — this is where occupancy control pays for itself fastest.	≤25	0.40	≥60	100–200	150
Indoor car park — traffic routes Bãi xe trong nhà — lối lưu thông Parking · Bãi xe	≤25	0.40	≥40	50–75	75
Entrance / exit ramp (daytime) Dốc ra vào (ban ngày) Parking · Bãi xe Daytime transition lighting to manage eye adaptation; drops to 75 lx at night.	≤25	0.40	≥40	300 (transition zone)	300
Gallery — light-sensitive exhibits Phòng trưng bày — hiện vật nhạy sáng Culture · Văn hoá Conservation-driven: 50 lx for textiles, works on paper and dyed leather; 150–200 lx for oil and tempera; annual exposure in lx·h is the real limit, not instantaneous lux.	≤19	0.40	≥90	50 (conservation)	—
Museum lobby / circulation Sảnh bảo tàng, lối tham quan Culture · Văn hoá Design the adaptation sequence from daylit entrance down to a 50 lx gallery, or the exhibits will read as black.	≤22	0.40	≥80	100–200	200

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