What is ANSI lumens?

C'est quoi ANSI lumens ?

ANSI lumens are a crucial measurement of a portable projector 's brightness. This unit of measurement, standardized by the American National Standards Institute (ANSI), indicates the quantity of visible light emitted by the projector. In other words, ANSI lumens determine how bright and clear the projected image will be, which is especially important for portable projectors used in a variety of environments.

How do ANSI lumens affect the viewing experience?

  1. Image Visibility: Higher light output, measured in ANSI lumens, produces a brighter image. This means that even in bright environments, such as a lit meeting room or a living room with windows, the projected image remains clear and easily visible. Without sufficient brightness, the image may appear dull and difficult to see, compromising the viewing experience.

  2. Contrast and color saturation: Higher brightness also improves the contrast and color saturation of the projected image. Dark details are better defined and colors are more vibrant, making the image more realistic and immersive. So even dark scenes or subtle details are rendered accurately, improving the overall quality of the viewing experience.

  3. Versatility of use: A floodlight with high light output offers greater versatility of use. It can be used in a variety of environments, from meeting rooms and living rooms to classrooms and home theaters, without compromising picture quality. This allows users to enjoy their favorite content in different situations, with an optimal viewing experience every time.

  4. Projection Settings: Finally, ANSI lumens also allow you to adjust projection settings based on specific needs. For example, in a dark environment, you can reduce the brightness to save power while maintaining high image quality. Conversely, in a bright environment, you can increase the brightness to compensate for ambient light and maintain clear visibility.

How are ANSI lumens measured?

  1. Standardized testing conditions: Tests are performed in controlled environments, such as dark rooms, for accurate and comparable results.

  2. Use of calibrated equipment: Measuring devices are calibrated to ensure accurate results.

  3. Choosing a standard projection surface: A standard projection surface is used to measure the brightness of the projected image.

  4. Brightness measurement: The brightness of the image is measured at several locations on the projection surface to obtain an average.

  5. Calculating ANSI lumens: Measurement results are converted to ANSI lumens using a standard formula that takes into account the average measured brightness and other factors such as screen size and projection distance.

How to choose the right projector based on ANSI lumens?

  1. Screen size and projection distance: The size of the screen on which you will project your content and the projection distance between the projector and the screen are key elements to consider. Larger screens or longer throw distances generally require projectors with higher light output (measured in ANSI lumens) to maintain a bright, sharp image.

  2. Viewing Environment: Consider the environment in which you will use the projector. If you plan to use it in a bright room, such as a meeting room or brightly lit living room, you will need a projector with higher brightness (more ANSI lumens) to compensate for ambient light and maintain an image clear. On the other hand, if you plan to use it in a dark room, a projector with a lower light output may be sufficient.

  3. Content type: The type of content you plan to project can also influence your choice of projector. For example, if you plan to watch movies with dark scenes and subtle details, a projector with a good contrast ratio may be more important than just high light output. However, for professional presentations with lots of text or graphics, higher brightness may be preferable to ensure clear visibility.

  4. Budget: Finally, your budget will play an important role in choosing the projector. Projectors with higher light output (measured in ANSI lumens) tend to be more expensive. It is therefore important to find a balance between the brightness needed and what you can afford to spend.


ANSI lumens provide a standardized and important measurement of projector brightness, allowing consumers to choose the right projector based on their specific brightness and viewing environment needs. By understanding this metric and its impact on the viewing experience, users can fully enjoy their screenings, whether they are professional presentations or home movie nights.

Reading next

Comment savoir si c'est un bon vidéoprojecteur ?
Comment fonctionne un projecteur portable ?