Their report advises that the bulbs should not be left on for extended periods, particularly near someone’s head, as they emit poisonous materials when switched on. Peter Braun, who carried out the tests at the Berlin's Alab Laboratory, said: “For such carcinogenic substances it is important they are kept as far away as possible from the human environment.” The bulbs are already widely used in the UK following EU direction to phase out traditional incandescent lighting by the end of this year.
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