Actually, even cheaper are available
PHILIPS X-TREME EXTREME VISION H4 NEW HEADLIGHT BULBS | eBay
Same thing. 17.3 GBP with free shipping. The seller has sold 9086 products with 99.9% +ve ratings so I think this is also a real deal.
Also on amazon, the H7 got sold more than H4 but I have no idea about it.
Also there is Osram nightbreaker for 13 pounds.
Can you help me decide? My objectives are
1-To have more light
2-But not to temporarily blind the person coming from opposite direction
3-Not to consume more power than the stock ones.