Not surprisingly, the price of an overhead projector increases with upgrades in lens quality. Also associated with the type of lens is the projector's focal length, which determines how close to or far from the screen the projector will focus. A projector's brightness is measured in lumens. Levels range from 1,700 to 11,000 lumens depending on the model you choose. If the projector will be used with an LCD projectionpanel, at least 4,000 lumens is recommended.
Lamps are critical components of all overhead projectors and vary in type, life, wattage and cost.
These projectors can save you money in the future by reducing your lamp replacement costs. A lampchanger which allows the presenter to switch over to another lamp is also a very valuable feature. With a lampchanger, you can be assured that your meeting will continue if you do have a lamp fail. There are a variety of other options which are tailored to presenters who use LCD panels. This makes setting up your equipment much easier.