Halfords used to sell a 25% brighter Xenon bulb. They now trumpet a 50% brighter bulb. Marketing hype? 'kin 'ell it is not. They are a bit pricey at £12 but I just put two of them into a cage with particularly poor dipped beam and *what* a difference. Very white light too. Worth the extra. Standard 55/60 wattage. Makes a nice change