3aafea85_lighting___Energy_Saving_Trust__Lighting_technology
[Description] CFL technology uses gas inside a glass tube which is charged with electricity until it glows and gives off light. They use about 75 to 80 per cent less electricity than equivalent traditional bulbs and can last up to ten times longer. They are available in a variety of shapes, sizes, colours and ranges of colour rendering capacity CFLs are great for replacing standard home light fittings. Spotlight bulbs are available but not widely and tend to be more expensive. [Lighting technology] 
Compact fluorescents (CFLs)
Energy efficient lighting | Energy Saving Trust
Lighting technology