3aafea85_lighting___Energy_Saving_Trust__Lighting_technology
[Description] A dark lamp shade can absorb more than half the light a bulb emits which can reduce the efficiency of your lighting. You can save energy and money by using transparent shades or fittings that you regularly clean. Light fittings with a reflective inside can increase efficiency if concentrated, directional light is required. Spotlight fittings often have this reflective inside. Halogen spotlights and LEDs do not require a reflective fitting as the reflective surface is incorporated into halogen bulbs while LEDs give out directional light by default. Some light fittings are designed to be used with CFLs only, however the tube-only CFL that you need for these fittings is more expensive by comparison to ordinary CFLs. [Lighting technology] 
Light fittings and shades
Energy efficient lighting | Energy Saving Trust
Lighting technology