When important information alone can't get their attention, your projected image will. Overhead projectors by 3M are bright enough to use with the room lights on, giving new life to overhead transparencies. 3M offers a wide range of accessories for your overhead projector, which will help you stay organized and focused on your presentations.You never know when your lamp might fail, so it's smart to carry a backup on business trips or keep a spare one at your presentation facility. 3M's projection lamps are ideally suited for this purpose, and the projector's lamp changer allows you to switch lamps without missing a beat.