Tips for Buying a Projector


What are lumens?

In this post we explain what are the lumens in a projector, how many lumens you need and their importance when choosing the equipment that best suits your needs.

Lumens are a unit of the international system of measures to measure the luminous power perceived by the human eye (symbol: LM). The standard was established by the American Standards Institute (ANSI) to make a more reliable measurement since earlier some brands of projectors had their own standards of what was a lumen.

Previously, luminosity was measured in Watts, now with the development of new low-energy lighting technologies; the lighting of a light bulb is measured in lumens. The more lumens you have a lamp, the more power of the bulb is higher and therefore the light emitted is brighter.

Some benefits of a brighter image (with more lumens) are as follows:

  • allows us to see the desired projection with greater brightness.
  • A greater amount of lumens gives the possibility to further remove the projector to the wall or projection screen so that the image is larger without sacrificing the visibility of the content to project.
  • We can project with daylight. A projector with a low amount of lumens will not allow us to see a bright image unless the room is very dark. If you want to project in a classroom with medium or outdoor light with daylight, a more lumens projector will be required.

The lumens, the quality of the image and the importance of the brightness

As mentioned in the input tips to buy a projector, there are other features in the projectors such as resolution and contrast, which are also related to the quality of the image. However, we do not have to leave out the lumens because we can have a Full HD projector with few lumens and perhaps a very large room where the image is not going to perceive to have the brightness enough.

How many lumens do I need?

This is the most frequent question our customers make to us. However, there is no exact answer to this question because it depends on several factors such as: the natural lighting of the room, the height of the ceiling, size, the type of content that you want to project and in general, the needs of the user.

For example, for a medium-illuminated room, if you want to project an image up to 2 meters wide, a minimum of 2000 lumens is recommended.

Here are some examples of the most common quantities to project in various media: Boardroom, home theater, auditorium and classroom. All depending on the amount of light in each room and the size of the image you want to project:

A. Boardroom

What are lumens?

You can also see the variety of boardroom projectors that we have available.

B. Home Theater

What are lumens?

You can also see the variety of professional home theater projectors that we have available.

C. Auditorium

What are lumens?

You can also see the variety of professional projectors for auditoriums that we have available.

D. Classroom

What are lumens?

You can also see the variety of classroom projectors that we have available.

TIP: It is important to consider that there are short or ultrashort draught projectors that are installed attached to the wall, so in this case a high amount of lumens is no longer required. Click here to view the catalogue of short or ultrashort shot projectors.

It is important to note that the foregoing is only an indicative, because as we discussed, there are particular factors involved in this decision. If you need more help do not hesitate to contact us via online Chat or contact to receive professional advice.

To get a better idea, here we leave a video of what a 2100 lumens projector looks like in an atmosphere of total darkness. As an example, the Epson Powerlite 1705C projector is shown. Click here for more information.

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