A previous study showed that subjects worked significantly more quickly at manipulative and inspection tasks under fluorescent light than under tungsten. An experimental conveyor belt was built to see if these results were confirmed bym subjects working on flow-line inspection. Two inspection tests were designed. (1) Links— inspection of plastic discs for surface flaws. (2) Buttons— inspection for off-centre holes, The conveyor belt and test objects were designed so that results could be scored automatically, Forty-four subjects were given four 20 min test sessions, two under fluorescent light and two under tungsten. Subjects overlooked significantly fewer faulty links under fluorescent light than under tungsten, but there were no significant differences due to lighting on the button-sorting task. It is suggested that the link task, being a task of visual acuity, is at a disadvantage under point-source illumination.