Let the projector cool down
This means that after switching off, do not disconnect the power until the fan noise has stopped. Typical after-cooling time is about one minute. The expensive lamps therefore live much longer.

Let the beamer run / do not switch it off for a short time
Short switch-on times are bad for the lamps, therefore it is better to operate beamers continuously than to save electricity because of five minutes.

Prefer black on white
White makes full use of the projector's light output and is therefore the brightest that can be displayed. Black is not actively produced by the projector, but rather the brightness of the room is visible. Nevertheless, white is the brightest and black the darkest thing that can be achieved, and therefore together they result in the brightest and most contrasty image.
On the other hand, one should in any case try out colours before using them generously, for example as a standard text or background colour. Often, the colour representation and contrast of the beamer image and the notebook representation differ considerably! Moreover, the image is darker than in a pure black-on-white representation.

Does the computer output an image signal?
Many notebooks only output an image signal if this is set via a computer-specific key combination.

Screen refresh rate 60 Hz
The screen refresh rate should not be unnecessarily high. 60 Hz is usually ideal for beamers and notebook screens.

"Poor" image display?
Fine details, thin lines or small fonts look bad during projection because beamers almost always interpolate the external image signal to their own internal resolution. Beamer resolutions between 1024 x 768 and 1920 x 1080 are typical, often also "crooked" values. Newer notebooks usually have a much higher resolution. (The exact data of the beamers are intentionally not recorded in this system to not support potential thieves).

You can do the following:

  •     Choose a font without thin lines and preferably a bit bigger. For example, PowerPoint of Office XP uses the font Arial in the size 32 pt as standard for text, for headlines even 44 pt.
  •     As a test, set the notebook to a lower resolution, e.g. 1024 x 768 and view the presentation with it. The presentation is then probably closer to the result than with higher resolutions.
  •     In rare cases, beamers make a mistake during interpolation, i.e. the automatic has chosen an unfortunate display form. To remedy this, all beamers have a function "Quick Align", "Auto Sync" or similar. If this function is activated, the beamer re-examines what to do. One can help the automatic beamer by making the whole screen as bright as possible during this new synchronisation.