Sorry prof. for my delay in replying... I was sick and just restarting slowly
Indeed I felt the projector dimmed just a little bit (to my eyes), I am watching it easier on my screen compared to the very first hours. Also painting my room had a huge impact on PQ and perceived CR seems higher, blacks are much blacker (even on my BW screen).
I know perceiving a dimming of the lamp after 150 Hours seems weird and probably ironic... (Am I just getting used to the brightness?...).
To cut short all this "imagination", I hope (and expect) it won't be long before I have some calibration and measurement gear. I promise to then measure brightness every 150 Hrs and report (only for you!
)