Where does your 'real world' law end? Should I analyse the chemical composition of the brake discs on the next car I buy to check they are OEM before I hand over the cash? It's within the realms of possibility and I'm spending a lot of money after all, so perhaps I should. Perhaps I should siphon out the fuel tank to check that the dealer is indeed providing me with a free tank of fuel before I enter my chip and pin? Hose isn't expensive and measuring liquid is dead easy after all, and hey, I'm spending thousands of pounds so what's a little petrol in the mouth! If my examples seem ridiculous then try reading your posts from our perspective.It still applies. How does it not?
It was not actually advertised with xenons, by the OP's admission. However, despite that, despite the laws protecting the buyer here, surely the buyer should still have some responsibility as to what he bought? Or am I the only one who doesn't seem to live in the real world? I wish I made so much money I didn't have to worry about what I was buying, relying solely on the law to back me up.
These lights appear to be a technical item and difficult to check for, it's not like the dealer claimed a red car was actually white and the customer didn't realise until they got home.