3aafea85_lighting___Energy_Saving_Trust__Lighting_technology
[Description] Halogen light bulbs also use filament technology but run at a higher temperature making them slightly more efficient than traditional light bulbs. They are mainly used in spotlight fittings. Though more efficient, they are often used in large quantities, increasing the total electricity used to light a room. The EU Commission started the phase-out of D and E-rated bulbs in September 2013. Often rooms with halogen spotlights are brighter than they need to be so you may be able to save money by installing lower output bulbs. LEDs are an excellent energy efficient alternative. [Lighting technology] 
Halogen light bulbs
Energy efficient lighting | Energy Saving Trust
Lighting technology