Thank you a lot Whaat!
I just downloaded this latest release, and gave it a try just to get a little more used about the new workflow and stuff. I set up a really simple scene and the result after a night of calculation is attached.
There are two light layers (a simple emitter behind the corner and the three lights in front), no specular materials. The light material of the three tubes is assigned directly to the cylinders. The spp reached has something astonishing: 1750 in 8 hours or so.

I don't know if it's because of the simplicity of the scene, but:
I mean, if that's not clear, that i expected the rendering process to be much slower than it turns out to be, using layers! I absolutely have to add something specular, now..
Btw, i noticed some kind of artifacts around the cylinders, some red spots that are not supposed to be. Perhaps it's a little bug or something. Sadly, I don't have the scene any more. The server just deleted it for it was on my desktop..
So here it is.
