The EU Energy Label for lighting
The energy label for light bulbs rates products' energy efficiency on an A++ to E scale and defines an estimated annual energy consumption based on 1000 hours use a year (just under 3 hours per day).
LEDs currently achieve an A rating or higher; CFLs will usually be B or A rated.
The most efficient halogens can get up to a B-rating, but many on the market are D-rated - certainly not efficient by today's standards.
I'm confused by lighting terminology! What is a lumen? What is colour temperature?
See the glossary in our lighting selection criteria page for a full description of lighting technical terms.
The Energy Saving Trust's pages on lighting
'The Right Light' guide (produced by EST and NHBC)
Professional lighting procurement guidelines