Halfords are doing "2 for 1" on their mega-bright (+50% brighter) range of replacement headlight bulbs. Perfect for dark and rainy winter nights. They got a rave review in a recent Auto Express comparison test and, at that price, they're as cheap if not cheaper than you can get any similar bulbs from anywhere else including eBay.... I've just fitted a pair of H4 bulbs (£14.99 for the two) to my wife's car and they're really good. I'd already paid to swap my original bulbs for a pair of "Osram Silverstars" a couple of years ago and they're definately brighter than those (and they were meant to be +50% and got rave reviews then.....) Headlight bulbs do get dimmer over time. If you're running ordinary Halogen headlights, do yourself a favour and grab a bargain!