Wjen you turn them on do they flicker very slightly first, before appearing to warm up and get brighter? Is so they're HIDs.
If you have them you can buy bulbs off eBay for about £9 each. You need to buy D2R bulbs, and you just need to increase the colour temperature. I think the standard bulbs are only 4300k which are very yellow. I have 10000k in my car and they are perfect white, but i might try 12000k next time for a bit more of a bluish tint.