The laser-light shows that have lately been dazzling disco dancers and rock and even classical concertgoers are now being closely watched by a new audience. The Food and Drug Administration's Bureau of Radiological Health has begun sending inspectors to light shows to make sure that FDA safety standards are being met. The bureau recently informed the Blue Oyster Cult, a rock band, that its laser show needed readjusting, and last month it abruptly halted a preview performance of an M.I.T.-sponsored light show scheduled to run all summer on the Mall in Washington, D.C.

The problem is that lasers produce beams of...

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