S. No.

Hospital environment

Lighting specification

Illuminance

(lux)

Color rendition (Ra)

1

Intensive care

General

Simple examinations

Examination/treatment

Night watch

Low level lighting

400

400

1000

20

90

90

90

90

2

Surgery & outpatients

Pre-op/recovery

Operating theatre

Operating theatre-source

At the body surface

At the depth

Specialized

500

1000

100,000

40,000

8,000

90

90

90

90