It doesn't matter what you use, the lights will brighten or dim with the revs, it's just the system. Keep your lighting system at it's optimum. Remove the bulb and clean the inside of the lens. Make sure the outside of you lens is clean. Make sure all your contacts are clean. Make sure your tail light is the same way. Replace your bulbs if you have too. The only alternative is to install a small battery and use it to run your lights and rewire accordingly. You may have to charge your battery every once in awhile, but it may give you better lighting.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90