WHAT DOES ANSI LUMEN MEAN?
Lumens refers to the measurement of brightness at the screen. This measurement is very vague as it does not take factors like screen size, projection lens, projector settings and aperture size into account. This is the brightness measurement initially used for overhead projectors. ANSI Lumens is a standard, laid down by the American National Standards Institution, to objectively measure the brightness of the image that a projector can project. The higher the value, the brighter the image, although the perceived brightness will depend on the screen size being used. A higher lumen value is required in environments where the projector will have to compete with high levels of ambient lighting. ANSI Lumens is a good indication of the average brightness of the image, taking the brightness uniformity, screen size, aspect ratio of the image, lens throw distance and type as well as colour temperature into account. A small room typically requires from 200 to 300 ANSI lumens, whereas a large room
