By look at it LED be the crown of power efficiency as LED uses very little power...

follow by LED as LED uses fluorescent tube at main lighting... so (same case as energy saver)

Bothe LCD and LED uses little power as LCD panel do not require alot of power to run furthermore most of this new LCDs has a build in inverter which reduce electricity...

CRT uses PLASMA gun (Vacumm tube) and should be on par with Plasma TV in term of power consumption