I rendered a bathroom where there is a mirror. I use cycles and an area light. When rendering, the light appears in the mirror as a white plane, not in the ‘not-reflected’ world… curiously, if I uncheck Multiple importance that white plane dissapears… but I get too much noise. Is there a way to avoid that white plane?
I’m not a cycles expert, but wouldn’t it be more beneficial to uncheck “camera”? I assume the main problem for you is the visibility of the source. Not it’s effect.