Head lights get dim when the plastic mirror of the head light turns pale and yellow by standing under sun.
It also gets dust inside the lens which makes it dimmer. Using 15 Rs desi buld instead of Stanley one also makes it dimmer.
When my 1998 model Cd70 got this problem, we changed its complete headlight assay.(reflector + its front plastic mirror + a new bulb) with genuine one. and the light was bright white as in a new bike.
Chinese bikes use very cheap headlight mirror... it has pathtic quality. the mirror and the reflector is v.low quslity and thus light gets fade really quickly. Try changing the light with genuine Atlas Honda's one.. should work.
It costed me 600rs.
In old good time there used to be original high quality glass mirror in headlights instead of the plastic ones... and they worked awesome and lasted very long.
Now manufacturers save cost.
I think that much modification isnt req. however, dont try cheaper headlight assays... ur bike wont hit light at the right position... it will go a little left or right. would focus a tiny sport, or disperse randomly in all directions.. not lighting the road properly.
however gud luck with the experiment u love them!