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Projection lamp (W)

Low-priced halogen lamps are normally sufficient for lectures in rooms with up to 30 people. Metal halide lamps are recommended for a larger audience, or if the reproduction of true colours is of special importance. Ohps with metal halide lamps bring more contrast to the image and, due to the spot-like light source, an even better picture sharpness.

Light output (lumen)

OHPs are daylight projectors which can be used without darkening the lecture room. In order to reach a good projection quality, a minimum light output on the screen is needed.

The recommended light output of the projector, measured in lumen for a small room (1m x 1m picture) is 1000 lumen, for a classroom (2m x 2m picture) would be 3500 lumen.

Lamp changer

If the lamp dies during a presentation or teaching session this would be inconvenient and disruptive. Automatic lamp changer will switch to the second lamp without any interruption of your lecture.

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Glossary of Audio Visual Terms »