win 7 + gtx970
Broken: 2,74 165598e 32bit + 64bit
Short description of error
In complicated scenes with a large number of lights the darkness of the scene despite brightening light and make noise.
All Bug see in Hidden lamps cause noise and darkening the scene.
A big nuisance.
Exact steps for others to reproduce the error
You render my file LAMP+SUN-bug.blend with there are lights and no lights in Cube ( lamps in layer nr10 ):.