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Projector Brightness
Projector brightness is measured in ANSI lumens. DLP and LCD projectors come in various sizes and brightness to suit the various environments that they will be used in and the users needs.
Ultra-portable projectors range from 800-2000 lumens in brightness. In most meeting environments, it is far more desirable if lights can be switched on whilst projecting to enable visual interaction with the audience. A projector with at least 800 lumens will suit an average sized room where there will be little ambient light.
Naturally, a larger audience will require a larger room with a larger image and therefore you will require a projector with greater brightness (1500 to 2000 lumens).
The following can be used as a guide for selecting the right brightness:
800 lumens - for lights-off, low ambient light presentations. Suitable for an average sized meeting room or boardroom with up to 10 people.
1000 lumens - Suitable for rooms with some ambient light, and lights on presentations. Suitable for a larger sized room with 10 - 20 people. 1000 lumens is now becoming the minimum requirement by projector users.
2000 lumens- Suitable for rooms with bright ambient light and lights on presentations. Suitable for large rooms with up to 80 people.
Projector Resolution
What is SVGA, XGA and SXGA?
These are the main standards of resolution. The resolution is the number of 'pixels' that the projector is capable of displaying. Pixels are the individual dots that make up the image on your computer.
SVGA, XGA and SXGA are terms that describe common resolutions used by computers and projectors.The table below shows you the number of pixels that are displayed in each common resolution.
| Resolution |
Horizontal Pixels |
Vertical Pixels |
Total Pixels ('000) |
| SVGA |
800 |
600 |
480 |
| XGA |
1024 |
768 |
786 |
| SXGA |
1280 |
1024 |
1311 |
So does the resolution just affect how sharp my image is?
No. It also affects the compatibility of your projector with your computer. If your computer is sending a signal to the projector that is XGA, and your projector has SVGA resolution, this will cause a poor image problem. Most projectors have compression technology, so you'll still see an image, but there are serious downsides with this (see the section on XGA and SXGA compression below for details).
You should also consider the longer-term investment you are making in a projector. Most computers sold today run in XGA resolution as standard, and SVGA is used less commonly. If you purchase a new computer that runs in XGA and you have an SVGA projector, you will not achieve the best image.
How do I find out what resolution my computer is using?
On a PC, go to Control Panel and select 'Display'. Then, click on the last tab, called 'Settings'. In the bottom right corner of this box is a setting called 'Screen Area'.If this reads '800 x 600' you are running in SVGA mode. If it reads '1024 x 768' you are running in XGA mode. If it reads '1280 x 1024' you are running in SXGA mode.
Can't I just change my resolution setting and buy an SVGA projector?
Yes you can, but the pay-off is that you will lose sharpness and will have the inconvenience of having to make sure your computer is always in SVGA mode for presentations.
My computer uses SVGA. Is XGA still better for me?
Yes. An XGA projector will handle an SVGA image without distortion, so you don't lose anything but you do get more flexibility to use different resolutions, and your projector is more future proof.
What is 'XGA compression' and 'SXGA compression'?
Most projectors will accept a resolution higher than their native resolution, but will 'compress' the computer's image into fewer pixels. The result is that some of the computer's pixels are 'shared' across the same pixel that the projector displays.
Contrast Ratio
High contrast ratio is the key to crisp and sharp image quality. It influences the range of tonal gradation a projector can express. High contrast ratio makes black look truly black, pictures appear clearer and more vibrant by smoothly reproducing the difference between the lightest and darknest portions of an image.
ABN: 39 253 957 680
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