I've found these LED replacement E27 bulbs to be good performers so far;
http://www.dealextreme.com/details.dx/sku.13421They are expensive but give excellent performance. Typically it will use around 7-8 Watts (measured using a power meter) and give around 500 Lumen so give around 70 Lumen per Watt, just slightly higher efficiency performance than an equivalent power CFL. i.e. the same efficiency of the larger 20+ Watt CFL bulbs. 2 or 3 of these will light a medium sized room, but with none of that 3-4 minute warm up delay of CFLs. LED based ligh bulbs also tend to be more robust than CFLs. The colour of the ones I have recieved appear to have a medium warm natural light rather than the more typically blueish tint of some other LEDs. Colour temperature I would estimate would be around 4000-5500K rather than the yellowish colour of standard Halogen.
They are around 7-8 times more expensive than CFLs but they have a design lifetime 7-8 times that of a CLF. They should typically have a domestic lifetime of 20-30 years in normal operation.
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