I think it is 80% than the others
The cost of CFLs was minimised by government subsidy, but in the UK that is now removed and the cost per bulb has risen to £3-4 each.
I would assume it means that the more efficient it is, the less energy it intakes and the more efficient the system is at retaining the energy it intakes.
A greater percentage of light, and a smaller percentage of infrared radiation and heat.
Yes, non energy efficient bulbs like the incandescents waste around 90% of there energy in the form of heat. LEDs and CFLs don't even come close.
The benefits of using CFLs could be maximized because when we are using CFL’s we think it is all good but it has some bad toxins that are creating the energy to make the light and make it use less energy. We have to dispose the CFLs properly to reduce the spread of the toxins.
If you are looking to use the new energy efficient light bulbs on a light dimmer you will need to buy specially made dimmable CFLs. Not all energy efficient light bulbs are compatible with dimmers so be sure to check the packaging for information.
More efficient and most efficient are the comparative and superlative forms of "efficient".
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The type of light bulbs that waste the most energy are incandescent bulbs. They are least efficient because around 90% of the energy is lost on heat. They are also the shortest-lived light bulbs. The most efficient lights are LED lights, followed by CFLs, followed by the new Halogen incandescent bulbs. See the related link below for more information.
Usually as a percentage. 80% efficient, for example.