In the run-up to the test, we defined practical requirements and the following test criteria:
- Image quality
- Functional scope
In order to be able to evaluate these criteria, we have defined several tests for the beamers.
First, the scope of delivery, functions, and connection options are checked. As soon as the beamers are put into operation, the operation is evaluated. This includes the menu navigation and the focusing of images. The image quality of the devices is checked with the aid of a test image. This image can be used to evaluate brightness, contrast and colour representation. While the beamers are in use, the room is darkened.
Furthermore, the fan volume is measured from a distance of 1 m and 20 cm. If the devices are equipped with loudspeakers, their volume is also measured and the quality assessed. To check the brightness, the devices are set to maximum brightness and project a white image onto a wall. A lux meter measures illuminance at nine points so that luminous flux can be calculated. After 30 minutes in operation, a thermal imaging camera is used to check how much the devices heat up.
In order to rule out errors and to ensure the stress of everyday use, each test takes place in several rounds.
The test criteria are given percentages depending on their importance. The final score is then objectively calculated from the test criteria using an algorithm.
Selection of products
Our product selection is based on an observation of the current market. In addition to popular branded products, we also include insider tips in our selection. Criteria such as price and range of functions are an important factor for us. The test field is also determined by analysis and evaluation of customer reviews and external tests (e.g. Stiftung Warentest).
The devices are purchased anonymously or lent to us by the manufacturer. Dealers and manufacturers have no influence on the tests and our evaluation.
As soon as new relevant products come onto the market, our test field is extended by these. The new products go through the same test as the already tested devices.