# Meshlights darker in final render

It seems like the emission shader lights up other objects stronger in the preview render than in final renders.

I'm using mesh lights in Blender 2.78. The error is reproducible by creating a plane with an emission shader and a subject with any kind of material, that's lit by the plane.

As I didn't find any reports of this issue, I'm wondering if I'm the only one experiencing it, and if so, what settings might cause this.

EDIT:

After resetting the preferences in the System tab this is the render:

It is a bit closer to the preview, but then I noticed that both of the lights are reflected two times. (Which was visible before, but I didn't realize it.)

I also tried to render with CPU, and the result was identical to the preview.

So it's definitely a problem with the GPU (Nvidia). It's unlikely a driver problem since I noticed the problem some weeks ago.

• hmm..here it looks the same. Try File->Load Factory settings. Maybe you have set something in the userpreferences or something.. Dec 6, 2016 at 13:39
• Have you applied the scale to your mesh lights? Dec 6, 2016 at 14:31
• I did now, but it didn't fix it. Dec 6, 2016 at 14:46