25-11-12, 10:19 PM
An earth problem is my first thought, although the fact it only affects one light of two is unusual.
Have you got both RLs earthing at the same point? If not, try earthing the dim one at the same point as the good one, and see if it makes any difference.
Have you got both RLs earthing at the same point? If not, try earthing the dim one at the same point as the good one, and see if it makes any difference.