Acura's HID color temperature looks close to bright halogens (a tad yellowish). My wife's Acura TL HID's have a higher color temperature (whiter).
Have you measured the voltage on your battery while the engine is on(alternator charging the battery)? It should be around 13.6 volts. An indication of a low alternator charge on vehicles with halogens bulbs is a more orangy and dimmed light output because of the lower voltage across the filament. In the HID side, it will translate into a smaller high-voltage feeding the HID light bulbs, which may affect the color temperature.
Are all the ground cables correctly attached/cleaned? A bad ground always robs power to any device attached to them.
Just a thought...
2011 Pearl White MDX Advanced
... OEM towing, 20 mm wheel adapters,
... rails/crossbars, black wheel well trims,
... side windows acrylic deflectors,
... Michelin Latitude Diamaris HP 285/45R19,
... Full size spare tire,
... 6000 Kelvin HID's
2010 Acura TL Tech.
2001 Mercedes ML 320
2005 Mercedes ML 500 AMG Package