If you want to stick with Halogens then the best and most efficient globe you can get is the Osram Rallye 65w Special service bulb. Much better then the Nightbreakers with twice the service life at 500hrs and a 2100 lumens output (up from 1500). They are not 100% legal as they are a 65watt bulb but are within the power and heat limits of the stock lamps and wiring. They are a big favourite of BMW motorcyclists (where I first found out about them). I have never had a problem at MOT time with them either. Do a search online for more info but they are the most efficient halogen bulb on the market and the best you will get in halogen. They are one of the best kept secrets of the car lighting world. Other then that its HID time.