What Lighting Levels Do I Need?

The Australian standard for required workplace illumination AS1680.1.2006 offers the following advice:

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 clearly printed documents for short periods. Waiting Rooms, staff canteens; rough checking of stock; rough bench and machine work; entrance 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, jewelry and watchmaking.