Lighting
LIGHTING
To convert the light level to a specific power, there is a basic rule: 2/3 W/m² per 100 lux.
Example:
We take the example of an office of 20m ² where 5 fluorescent tubes 36W lamps are hanging. Fluorescent tubes are relatively efficient and give about 80 lm/W off. In addition, we let the electrical ballast out of consideration. The amount of light (lm) of the lights coming is then 5 x 36 W x 80 lm / W = 14,400 lm. Furthermore, we assume an efficiency of 80% for the fixture and an efficiency of 70% for the room. The illuminance on the floor is 80% x 70% x 14,400 / 20 sqm. = 400 lm / m² or 400 lux.
In addition to the choice of the 36 Watt, we have some alternatives with 2 x 36 Watt, 1 x 58 Watt or 2 x 58 Watt.
1. Spaces where 200-300 lux per m² is required:
- Storage spaces
- Archives
- Industrial buildings
- Workplaces
2. Spaces where 450-500 lux per m2 is required:
- Office
- Fitness
- Gym
- Showroom
- Classrooms
- Kindergarten
- Retail spaces
- Entrance / corridor / waiting room
3. Spaces where 800-1000 lux per m2 is required:
- Optician
- Laboratory
- Dentist
- Kitchen