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This reminds me of an issue we had at work with people being sensitive to flourescent strip lighting. We had another team merge with ours and the people who joined us previously worked in an office with tradition lightbulbs. When they moved into our offices two people started to suffer from eye strain and headaches. H&S concluded it was down to the flourescent lights. Out of 11 people they were the only two who were suffering. Fortunately it was possible to accomadate them in an older part of our building with lighbulbs and their headaches stopped.