http://cgi.ebay.co.uk/2x-4-LED-Xenon-wh ... m153.l1262
When you look at the product, you can see that there are resistors soldered into the bulb, prolly to aid the voltage / amp issue you talk about.
Dunno how long darren has had his, he may be able to tell us how long he's had them.
And even so, at £2.99 for the pair, it's hardly gonna break the bank.