Tell me the difference please?

no difference.

both H7 55w

but there are far cheaper bulbs on ebay.
i got a pair for £7(inc del) and another pair from TKmax for £2.99
bothe pairs were H7 55w xenon white, brighter than standard bulbs.
 
Bulbs vary so much and one set of bulbs is definitely not equal to another set.

From experience, the philips x-treme bulbs are good
 
I used to get bum raped at halfrauds for bulbs they used to last for ages though
 
I've got a trade card, well worth trying to get one if you can! Won't get much discount on the uprated bulbs I wouldn't think. Standard bulbs are dirt cheap on it though!