I've got a little over 200 hours on my original lamp on my RS40 with no problems.
In fact, the brightness has actually improved by over 30% from my first measurement.Lumens are still looking good at 207 hours.
My 3D is fine with virtually no ghosting.
I estimate that for my first 50 hours my 3D usage was about equal to my 2D usage. Now, maybe 5%-10% of my usage is 3D.
In anticipation of questions of why the decrease in 3D viewing, I love 3D, but I no longer watch 3D just because it is 3D. After the initial novelty of watching 3D I've adjusted my viewing to buying titles that reviewers say are well done. I would rather watch non-horror live action 3D than animated 3D and most 3D titles seem to be animated. So the net result is that my percentage of 3D viewing has decreased greatly.