Reasons for low headlamp output on Honda CBF 125?

[Dude]

My Honda CBF 125 is at least 3 years old. I've only recently changed my battery, but i consistently seem to have low power output to my headlamp, the bulb is a new 35/35. and unless i rev my engine the light goes really very dull, my guess is probably a faulty alternator or headlamp relay perhaps?? any inputs would be greatly appreciated.
cheers.

[Terry Smith]

Thanks for taking the time to discuss this. I love learning more about this topic.