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You have 4300k bulbs in your truck if you have stock HID's, depending on if you have D1S or D2S, I have an 03' and have D1S, which are harder to find, but you can get 5000k, 6000k or 8000k, the stock bulbs put out the most light (4300k) I have a set of 5000k bulbs that are blue/purple, I though they looked great at first (and they do look great) but I missed the light output, the real white light, so I went back to the stock bulbs. The HID's are not cheap, they will cost you about $100.00 per bulb usually.