You may choose to get your lights reflector cleaned if they are 'very dirty'.
Halogen is type of bulb, koito is company. For relays, you need to go to a 'good' electrician (recommended by Pakwheel members). I have been using relays for the last 6 years, never had a problem with wiring.
Check your Grounding too (by electrician), (Google it for more info). It is also very helpful for improving electrical equipment efficiency (e.g. faster radiator fan, brighter headlights, better engine performance etc).
And don't forget to adjust lights, after getting work done.