Well, there are no 10K Kelvin HID lights made. I do know that a few of the disreputable cheap companys that make throw away HIDs paint the bulbs blue or purple to make the bulbs appear 10K, but these bulbs are far far dimmer than true 4300K bulbs. If you want the brightest buble (per watt) get some real bulbs in the 4300K range.
Otherwise you'll look like one of those people who put blue bulbs in because they wanted everyone else to think they have HID.