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DLPDLCR2000EVM: Coloured patch visible when screen is "black"

Part Number: DLPDLCR2000EVM

When the screen should be "black" (black curtain) I have a dim, slightly purple patch visible in the bottom quarter, right hand third,  If I change the led power (LedSet.py) the patch also changes brightness, though not relative to the almost black rest of the screen.

I'll be returning it, I've only had it a few days, but I want to know if this is a one off, or common, so I know whether to get another one or not.

I want to going to project a clock overnight when not otherwise used, so a (dim) splodge of colour would get annoying pretty quick!

Thanks in advance.