In general situation: under the sunlight is 100000 lux. Cloudy day outside is 10000 lux. Indoor fluorescent lamp is 100 lux. 60w lamp from 60 cm desktop is 300 lux; Television studio is 1000 lux; Dusk indoor is 10 lux; Street lights at night is 0.1 LUX. Candle in the distance of 20cm is 10 ~ 15 lux.
Different intensity of illumination in different areas at the same time
The illumination engineering society (IES) proposed a simple method to determine the minimum illumination level, this kind of method for complex problem is a relatively simple method. But IES suggest lighting levels higher than in Europe.
In general, we should choose light source depends on Electricity efficiency and proper illumination of the space besides on the basis of indoor whole planning. Each place for different purpose, all have its proper illuminance to cooperate.
Keeping suitable illuminance will benefit to study and work. It is harmful to the eyes when studying or working under too strong or too dark light.
For example, to meet the needs of living room lighting illumination is 150-300 lux. Generally the study of illuminance is 100 lux, but read when the lighting intensity of illumination is 600 lux, so it’s best to use desk lamp as local lighting.
