Sorry to ask , regarding blue vision ultra headlight bulb for viva

Is it just only plug n play ? Remove the old halogen bulb and replace it ?
If yes roughly hw much % brighter than stock bulb ?
Does that 4000k is more close to white or gold ?

Any similar bulb with brand osram ?
What's the different between osram n Philips ?
After change the bulb to osram/Philips does the hi/low beam still working ?

Price plus installation ?

Hope to hear from you soon
Thx