A city library tested movable study lamps in rooms where fixed ceiling lights created glare on tablet screens. The effect of placing a lamp beside each desk, together with the option to adjust its angle, was measured for four weeks. Students reported less eye strain, but the library did not treat the reports as proof that brighter light always improves concentration. The ability of users to change the direction of the light was what made the lamps useful in different seats. In rooms with large windows, some students turned the lamps off during the afternoon. Others used them only when reading printed pages. The trial therefore supported a limited conclusion: adjustable lighting can reduce a mismatch between a task and its surroundings, while the best setting depends on the material, the seat, and the time of day.