Light ergonomics is the relationship between the light source and the individual.[1] Poor light can be divided into the following:
The effects of poor light can include the following:
Recommended Illumination Levels[2] | |
---|---|
Type of Activity | Ranges of Illuminations (Lux) |
Public spaces with dark surroundings | 30 |
Simple orientation for short temporary visits | 50 |
Working spaces where visual tasks are only occasionally performed | 100 |
Performance of visual tasks of high contrast or large scale | 300 |
Performance of visual tasks of medium contrast or small size | 500 |
Performance of visual tasks of low contrast or very small size | 1000 |
Performance of visual tasks near threshold of person's ability to recognize an image | 3000-10000 |
Light Bulbs[3] | ||||
---|---|---|---|---|
Type | Common Application | Efficiency | Colour Rendering | Fog-Smog Penetration |
Incandescent | Homes | Poor | Good | |
Fluorescent | Home&Office | Good | Fair to good | |
Mercury | Factories, offices | Fair | Fair to moderate | |
Low pressure sodium | Roadway | Good | Poor | Good |
High pressure sodium | Factories, commercial | Good | Fair to good | Good |
Metal Halide | Factories, commercial | Good | Good | |
Light-emitting diode (LED) | Home & office, commercial, industrial | Excellent | Good |