Well, time to test and have fun with 2.3_v5, I did exactly the same shot, the big, actually huge difference, NO RESIZING this time, what you see is what I got, I just played with the new inbuilt hotpixel removal, with values from .1 to .5 in the last ones, test 14 is the same as 12 but with new build, you can see that light efficiency is better so I had to tweak tonemapper to get a more dark shot (which I was after) than in previous build, specs as always in filename. After the first shots I added the FROSTED glass, which is something we want to add to the real thing since it's too bright right now. I love the results and I love this build, plain awesome.
For comparation sake I've added a picture I've took with my cell of the actual lamp, you can figure out which one it is since there is a different solution for the lamp holder.
Hope you like, 'cause I'm having lot's of fun
btw, 30 minutes was probably more than enough, but I was doing other things and I stoped them when I could.