[OrionN]

maddmaxx,
IMO, lighting is important. Without it, your sick anemone will loose all his zooxanthealle and after treatment he will be that much more difficult to bring back. Really bright light is not essential but enough light (more is better IMO unless it cause temp instability) so that the anemone will not loose all of his zooxanthallae. Your light should be fine. As long as there are zooxanthallae still in the anemone, they will repopulate the tissue easy enough.

It is unlikely that the light will help anemone produce enough calorie to sustain himself especially with infection and injury. Since they are not eating with treatment, anything help.