Nowadays, people's lives are inseparable from light, lighting has been integrated into life, and plays a vital role in some aspects, such as emergency lighting, safety lighting and so on. Below, I will introduce in detail the common functions and methods of lighting.
According to the function, lighting is divided into the following types：
1. General lighting: Lighting methods that illuminate the entire site facilities without considering various needs.
2. Partition general lighting: according to the demand in some specific areas to improve the illumination of the lighting.
3. Local lighting: generally refers to the way of specific lighting for a small range.
4. Mixed lighting: refers to the lighting method of general lighting and local lighting.
5. Emergency lighting: When the normal lighting fails, the lighting mode is activated.
6. Backup lighting: When normal lighting fails, the lighting mode is set to ensure normal activities, such as elevator lighting during power failure.
7. Safety lighting: When normal lighting fails, the lighting method is used to ensure the safety of people in danger.
8. Evacuation lighting: When the normal lighting fails, ensure that the emergency exit and evacuation channel can be clearly identified, so that people can safely evacuate the lighting. Normal lighting Under normal circumstances, the basic lighting of the safety channel is also evacuation lighting.
Before introducing the following content, first explain the definition of the assumed work surface in the lighting project
Assumed working face: refers to the reference plane specified in the "building lighting design Standard", that is, the plane of measuring or specifying illumination, the plane of 1 meter from the ground is generally taken in industrial buildings, and the plane of 0.75 meters from the ground is generally taken in civil buildings.
According to the lighting system, it can be divided into the following kinds of lighting：
1. Direct lighting: 90%-100% of the light of the lamp is directly projected to the lighting mode of the assumed working surface.
2. Semi-direct lighting: 60%-90% of the light of the lamp is directly projected to the assumed working surface, and 10%-40% of the light is projected to the lighting mode of the space and building.
3. Uniform diffuse lighting: The lighting mode in which 40%-60% of the light of the lamp is projected to the assumed working surface and the other part is projected to the space and building.
4. Semi-indirect lighting: 10%-40% of the light of the lamp is projected to the assumed working surface, and most of the other is projected to the space and building lighting.
5. Indirect lighting: 10% of the light of the lamp is projected on the assumed working surface, and most of the light is projected on the space and building.
6. Key lighting: directional lighting to highlight a certain area or target.
7. Diffuse lighting: The lighting mode in which the light is evenly projected on the working face or object, and there is no significant difference in any direction.
In the lighting project, the application of semi-direct lighting and semi-indirect lighting and key lighting is more common.
