HID sounds good but i was reading you have to spend top money to get results?
as far as the colour effecting the brightness.......yeah it has to effect it. i noticed a blue layer on the bulb chipping off.
so away with the blue and in with the standard for now just to see if there is a dif.
will check the reflectiveness on the inside, sounds difficult to actually check but has to be done.
may look at some other bulbs? i just thought it may have been some sort of power loss?
oh well will get out in the cold tomorrow and have a look.