Sorry, when you mention white light for old bimmer, do you means only the bulb or the HID.
There are 3 type of upgrade for headlight.
1. change the bulb where the colour is white but not very bright
2. Upgrade the bulb to HID c/e ballast (very bright)
3. change the whole headlamp assembly (hella)
In order to answer your question, can you tell me what model are you driving. For e36, I can tell a bit about upgrading. Unfortunately, you cant install angel eye for e30 and e34 except put HID kit.
Side glass for the signal light can be change to white or clear plastic instead of the yellow filter.