![]() If you picture a tic-tac-toe grid covering the entire image, with evenly spaced columns and rows, the nine measurement points would be at the center of each rectangle in the grid, as indicated by the black dots in the image below. Measuring ANSI lumens-a procedure developed by the American National Standards Institute (ANSI)-requires measuring nine specific points in a 100% white image and using the average of all nine to calculate brightness. We'll start with ANSI lumens, which is the most common approach, and the primary one we report in our reviews. All involve taking a measurement or measurements with a light meter and calculating brightness in lumens based on the readings and the area of the image. That said, we'll largely ignore this technical distinction between illuminance and brightness for the rest of this article and use the less precise, but more common, definition for brightness to include illuminance.īeyond this semantic issue, there are several distinctly different approaches to measuring lumens. But at closer distances, the illuminance will be spread out over smaller areas, so the image will be brighter. However far you put a projector from a screen, it will (with any given settings) offer the same illuminance. Lumens are actually a measure of illuminance, which refers to the intensity of light coming out of the projector.Įven if you never use the technically accurate definitions, the difference between the two is important to keep in mind, because when you measure lumens-the illuminance of a projector-you're not measuring the brightness of the image. ![]() Technically speaking, brightness is strictly a matter of perception, so talking about how bright something is really refers to how bright it looks. One minor issue is that even though most people, including us, talk about lumens as a measure of brightness, it actually isn't. This is especially true because there are several ways to measure lumens, so two projectors with the same lumen rating aren't necessarily equally bright. ![]() Given how critical this spec is to choosing the right projector for the image size you want, it can be helpful to know a little more about it. Go smaller than the low end of the range, and the image will be too bright for comfortable viewing Go larger than the high end of the range, and colors will become increasingly more washed out at larger and larger sizes as the image gets progressively dimmer. Quite simply, how many lumens the projector delivers determines the range of usable image sizes for any given level of ambient light. ![]() One of the most basic specs-and most important measurements-for any projector is lumens. ![]()
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