are there any differences between the ballasts for HIDs?? can i put different kelvin bulbs with any of them??

 

yes there's a difference in ballast. You have your OEM ballast and your cheap aftermarket ballast. You have ballast that require D2S/D2R bulbs, D4S/D4R bulbs, and D1S/D1R bulbs. Then you have the cheap aftermarket ones that have whatever size bulbs you need for your car

 

besides bulb sizes can i put different kelvin temperature bulbs in them??

 

If your ballasts use the AMP connectors typically found on aftermarket kits, then you can purchase new aftermarket capsules that generate a different Kelvin temperature (assuming they use the same AMP connectors). Most OEM capsules are only available in 4300K or 6000K and do not use AMP connectors.

 

you can still get a D series connector to connect a d based bulb like d2s d4 etc to a regular aftermarket ballast.

color temp makes no difference. if the bulbs will plug into the ballast you are good to go.