I'm off to the Alps soon so I'll be getting mine today. This is about the price of one main bulb, but here you get 2.
Here's the blurb,
* Suitable for a wide variety of cars - see packaging for full compatibility list
* High-quality OEM Bulbs
* Conform to ECE-R37
* Choose from 12V sets including 2x H4 or H7 light bulbs, fuses and other spare bulbs
These bulbs emit 50% more light and have an increased light range of up 20m more than normal bulbs, thus helping to increase road safety and ensure that obstacles or potential hazards can be seen sooner and indeed more clearly.