The brighter the ambient light, the more obvious the influence on the projection effect. Just like a projector, it is better to close the window, and it is almost the same with the window open. Although the impact on the projection lamp is not great, in some cases, such as where you want to project, the projected pattern is very poor, and the ground where you project is illuminated by a large spotlight, which obviously dilutes the projection effect. If the projection bulb works for a long time, the imaging system inside the projector may announce a lot of heat, which will lead to a rapid increase in the temperature inside the projector. Because the inner wall of the projector bulb will be devitrified at high temperature, there will be white mottling, so many devitrified places block the light, which will cause the temperature in this part of the area to rise abnormally, and then lead to the further expansion of the devitrified area and the rapid decline of brightness, which is likely to lead to the bursting of the bulb. Therefore, we must pay attention to make the duration of each operation of the projector not exceed four hours as much as possible.