The ANSI rating is a good guide to indicate Projector brightness. However, the measurements publicised by manufacturers are based on their own ratings and are not independently tested. In practice this means that ANSI Lumens measurements from different manufacturers vary considerably. It is not uncommon for a lower rated unit from one manufacturer to outperform a higher specified Projector from another. The best solution always is to receive a demonstration from a Projector dealer and even if necessary have a shootout of competing models.