According to
http://www.powerbulbs.co.uk/
the Cool Blues are E approved, but other than that I'm with Northwind.
Depends a bit what bulbs you have in at present, the stock bulb might well be a 45/45W H4, in which case any 60/55W will be better, but I'd plump for Osram SilverStars or Phillips Vision Plus if you want the best light (unless you want to spend more on PIAA).