Here is another fine thing I would tell about. Based on the first glass image. 

Originally, I've set another light (a spot) in the scene and used lightgroups to seperate lightsources.

For the first image I have set the spot to 0. This image here is the same, but the spot-light set to it's original value.

Note: I did not render this image anymore! I just raised his gain and let Lux do a new tonemapping. That's all and I got the image above a few seconds later.

---