Shouldn't be a issue, 8000k ballast won't make a 6000k d2s bulb brighter though. If you want decent light output on the road then go for oem 4300k or 5000k.
A ballast simply ignites the bulb, it's the tempreture of the bulb what effect light output
thanks there not ds2 bulbs iv swopped them for a hid kit 8000k but there not that light and selling my genuin ones,the hid kit is very blue , looks like ill have to sell that and just get a 6000k hid kits then tar