Lighting Levels

 

 

The CIBSE (Chartered Institute of Building Services Engineers) produces a Code for Interior Lighting which gives lighting requirements for areas.

This is also replicated in BS EN 12464-1:2002 Light and lighting - Lighting of work places - Part 1: Indoor work places

 

A sample is shown below.

 

Illuminance (lux)

Activity

Area

100

Casual seeing

Corridors, changing rooms, stores

150

Some perception of detail

Loading bays, switch rooms, plant rooms

200

Continuously occupied

Foyers, entrance halls, dining rooms

300

Visual tasks moderately easy

Libraries, sports halls, lecture theatres.

500

Visual tasks moderately difficult

General offices, kitchens, laboratories, retail shops.

750

Visual tasks difficult

Drawing offices, meat inspection, chain stores.

1000

Visual tasks very difficult

General inspection, electronic assembly, paintwork, supermarkets.

1500

Visual tasks extremely difficult

Fine work and inspection, precision assembly.

2000

Visual tasks exceptionally difficult

Assembly of minute items, finished fabric inspection.

 

 

Extracts from CIBSE Code for Lighting Part 2 (2002)

 

Educational

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

Classrooms

300

19

80

TechnicaI drawing room

750

16

80

Computer practice rooms

300

19

80

 

 

Healthcare - Wards

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

General lighting

100

19

80

Reading lighting

300

19

80

Simple examinations

300

19

80

Examination and treatment

1000

19

80

 

 

Hotels and Restaurants

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

Kitchen

500

22

80

Restaurant, dining room, function room.

-

-

80

Self service restaurant

200

22

80

Conference rooms

500

19

80

 

 

Offices

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

Filing, copying etc.

300

19

80

Writing, typing, reading, data processing

500

19

80

TechnicaI drawing

750

16

80

CAD work stations

500

19

80

Conference and meeting rooms

500

19

80

Reception desk

300

22

80

Archives

200

25

80

 

 

Residential - Flats /Bedsits

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

Lounge

100 - 300

19

80

Kitchens

150 - 300

-

80

Bathrooms

150

-

80

Toilets

100

-

80

 

 

Retail Premises

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

Sales area

300

22

80

Till area

500

19

80

Wrapper table

500

19

80

 

 

Theatres, Concert Halls and Cinemas

 

Area

Illuminance (lux)

Limiting Glare rating

Minimum colour rendering (Ra)

Practice rooms, dressing rooms

300

22

80

Foyers

200

-

-

Auditoria

100

-

-

 

There are also some Lighting Guides from CIBSE that gives details for various building types, for example;

 

Lighting Guide 7 (2005): Office lighting

 

The recommended design maintained illuminance over the task area in any room where office work is carried out is generally in the range 300 to 500 lux.

Where the tasks are mainly screen based, such as data retrieval or telephone sales, then illuminances at the lower end of this range should be used.

Where the tasks are mainly document based, such as writing or copy typing, then 500 lux will be required.

Where there are visually more onerous tasks, such as proof reading or technical drawing, even higher levels should be considered.

The minimum level set by the Health and Safety Executive for any permanently occupied area is 200 lux.

 

Lighting Guide 1 (1989): The Industrial Environment

 

For recommendations of illuminance, colour rendering and glare see Schedule in the Code for Lighting a summary of key values are given below.

 

Area

Illuminance (lux)

Lifts

100

Corridors and stairs

100

Toilets

100

Canteens

300

Mess rooms

150 - 300

Plant rooms

150 - 300

Store rooms

100

 

More illuminance values are given for a range of industrial buildings in the Guides.