Unless you get the actual mirror finish of chrome, painting silver will reduce light - the greatest effect will be with white as it is naturally bright and reflects the best after smooth mirror. But good job.
That used to be my first tackle on any Khybers rear lights, remove and wash lenses - paint white, cut out the side marker socket plug and insert new socket with bulb and connect to parking circuit with new branded bulbs all around. Pak suzuki being the cheapies they are conveniently forget such details.