You have 2 options when upgrading your headlight:
1. Change the bulb to make it look whiter/bluer, etc.
2. Install HID.
If you saw those Lexus, BMW that have blue light (from far) and then becomes white as they get close, that's a HID.
The only way to get the HID look is by installing a HID. If you just replace your bulb, people can still see that it's not a real HID. Yes, it might look whiter or bluer than other cars, but it's not HID.