As far as I was aware the touch screen technology used on the T1 is similar to that used on the x50 range i.e. IR.
I have a 650 that I use every night in bed and the only light source is two halogen spots, and I've never had a problem with the touch screen.
Perhaps a clean around the bezel might help. I was getting some odd pop-ups when waking my 650 which was cured by lightly brushing around the screen edge.
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