| Class of Task |
Recommended Maintained illuminance lux
|
Characteristics of the activity/interior |
Representative activities/interiors |
| Movement and Orientation |
40 |
Interiors rarely visited with visual tasks limited to movement and orientation |
Corridors, cable tunnels, indoor storage tanks; walkways |
| Rough Intermittent |
80 |
Interiors requiring intermittent use with visual tasks limited to movement, orientation and coarse detail. |
Staff change rooms; live storage of bulky materials; dead storage of materials needing care;locker rooms;loading bays |
| Simple Workplace tasks |
160 |
Any continuously occupied interior where there are no tasks requiring perception of other than coarse detail. Occasional reading of clealry printed documents for short periods. |
Waiting Rooms, staff canteens; rough checking of stock; rough bench and machine work; enterance halls; general fabrication of structural steel; casting concrete; automated process monitoring; turbine halls. |
| Ordinary or Moderately easy work tasks |
240 |
Continuously occupied interiors with moderately easy visual tasks with high contrasts or large detail |
School chalkboards and charts; medium woodworking; food preparation; counters for transactions. |
| Moderately Difficult work tasks |
320-400 |
Areas where visual tasks are moderately difficult with moderate detail or with low contrasts |
Routine office tasks eg reading, typing, enquiry desks. Inspection of medium work; fine woodwork; car assembly |
| Difficult work tasks |
600 |
Areas where visual tasks are difficult with small detail or with low contrast |
Drawing boards; most inspection tasks;proofreading;fine machine work; fine painting and finishing; colour matching |
| Very difficult work tasks |
800 |
Areas where visual tasks are very difficult with very small detail or with very low contrast |
Fine inspection;paint retouching; fine manufacture; grading of dark materials; clolour matching of dyes. |
| Extremely Difficult |
1200 |
Areas where visual tasks are extremely difficult with extremely small detail or f low contrast. Visual aids may assist |
Graphic arts inspection; hand tailoring; fine die sinking; inspection of dark goods; extra fine benchwork |
| Exceptionally Difficult |
1600 |
Areas where visual tasks are exceptionally difficult with exceptionally small detail or with very low contrasts. Visual aids will be of advantage. |
Finished fabric inspection; assembly of minute mechanisms, jewellry and watchmaking. |
