I own an Epson Powerlite S1+.. after about 200 hours of lamp use, there appeared what looks like purple discoloration on my screen (blackout cloth).
No ambient light whatsoever, and its only most visible on a light or dark colored background. In between is hardest to notice... but overall you really only notice it because you know it's there, ya know?
Pic attached kinda shows what i mean.. if you can see it.
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