It may seem a paradox that we consume more energy in lighting during the day considering the requirements of major consumers such as industries, offices, schools, universities, public buildings, shops, etc. Since these establishments consume some 20% – 63% of total energy needs for lighting, it appears that a significant reduction in energy consumed for lighting, could result in a serious economic and environmental benefit. According to measurements by the International Energy Agency (IEA) in Europe, buildings use lighting in:
- Offices 30-40% of the consumed energy
- Schools and Universities, public buildings 51%
- Hospitals 63%
- Shops 35%
- Warehouses 34%
Globally, almost 1/5 of the total amount of electricity generated is consumed by the lighting sector. The total electricity consumption of lighting is more than the global electricity produced by hydro or nuclear power plants, and almost the same as the electricity produced with natural gas. Energy for lighting is equivalent to burning 65.6 million tons of mineral-oil with an enormous burden on the environment.
The total emission of CO2 is estimated at 1.9 billion tons in the atmosphere.
Lighting is one of the biggest causes of energy-related greenhouse gas emissions.