blue400

hi, i just installed a phillips 6000k hid system into my car( i have a 91 Ls400) and on the right its is very white, but on the left it is very yellow. does any one know what the problem is? and also can i put different brand hid globes onto the system?...... one more thing i have 235/35/18 on all four wheels, i was wondering if i can go any wider on the rear? thanks