I agree that power consumption comparisons are interesting for LED lights but the missing link is the rapidly improving amount of light output per electrical watt consumed.
Consider how much light some of the so called headband head-light LED things put out - and the lights on push bikes.
That said, I am not sure how much reliance to place on some of the quoted Lumens figures - some LED's with relatively low numbers seem a lot brighter than those with higher claimed outputs.
Perhaps a manufacturer honesty measure?
I would like to replace my halogen wing tip lights with push bike LED's but the clever internal switching arrangements have made that not such a simple task.
There is another clever wrinkle to these high power LED's too - the manufacturers build in heat protection circuits which actually switch the LED on and off to keep heat within limits.
Because of the persistence of the eye we do not notice this happening but it does and it introduces RF energy to the wiring.
But when it is all added up, LED's are getting better every day and are the way to go.