Most ficus trees enjoy bright indirect or filtered light with variegated varieties happily able to take medium light. Bright, direct light may result in scalding of the leaves and leaf loss. Ficus trees also cannot tolerate low temperatures or drafts.
They need to be kept in temperatures above 16C. (60F.) and actually prefer temperatures above 21C. (70F.). Cold drafts from windows or doors will harm them, so make sure to place them somewhere where drafts will not be an issue.