For usual reading, illumination level required is around

Activity

Illumination (lux, lumen/m2 )

Public areas with dark surroundings

20 - 50

Simple orientation for short visits

50 – 100

Working areas where visual tasks are only occasionally performed

100 – 150

Warehouses, Homes, Theatres, Archives

150

Easy Office Work, Classes,

250

Normal Office Work, PC Work, Study Library, Groceries, Show Rooms, Laboratories, Normal reading

200-300

Supermarkets, Mechanical Workshops, Office Landscapes

750

Normal Drawing Work, Detailed Mechanical Workshops, Operation Theatres

1,000

Detailed Drawing Work, Very Detailed Mechanical Works

1500 - 2000

Performance of visual tasks of low contrast and very small size for prolonged periods of time

2000 - 5000

Performance of very prolonged and exacting visual tasks

5000 - 10000

Performance of very special visual tasks of extremely low contrast and small size

10000 - 20000