一、根据教学环境选购投影机教学环境是对教学活动影响最大、最直接的因素。亮度是我们选择投影机时应特别关注的性能指标,但并非亮度越高越好,高亮度在带来强烈视觉感受的同时,也伴随着灯泡的大功率消耗和昂贵的后期维修费用。合适的亮度,取决于投影多大的画面和采光,画面越大,则使用者感受到的亮度越低,反之越亮。太暗的画面眼睛会感到吃力, First, according to the teaching environment Optional projector teaching environment is the most influential teaching activities, the most direct factor. Brightness is a performance indicator we should pay particular attention to when choosing a projector, but not the brighter the better, the higher brightness brings a strong visual experience, along with the bulky power consumption and expensive post-maintenance costs. The appropriate brightness, depending on how much projection screen and lighting, the larger the screen, the user feel the brightness of the lower, and the brighter the contrary. Too dark picture eyes will feel hard,