Epson EB-760W projector WXGA, 4100 ANSI lumens, Wi-Fi, White

The ANSI lumen is a standard unit for comparing brightness between projectors. 4100 ANSI lumens is a lot: slides and the board image stay readable even with the ceiling lights on while students take notes. The teacher does not have to switch the lights on and off during a lesson. If the sun shines directly on the projection surface, it is still worth covering the windows, because direct sunlight washes out the picture of any projector.

The 1280 × 800 resolution has a 16:10 aspect ratio, the same as many laptops. The teacher's or presenter's screen appears on the wall without cropped edges or empty bars. For slides, spreadsheets and text at a normal font size WXGA is enough. If the picture contains a lot of small text or detailed drawings, a Full HD projector gives more room.

The contrast ratio shows the difference between the lightest and the darkest tone. The 2,500,000:1 figure stated by the manufacturer means light text on a dark background and dark charts on a light background are easy to tell apart. Real contrast depends on the room: light walls and stray light reduce it, so a room with darker walls and covered windows gives a deeper picture.

In a 3LCD projector red, green and blue each have their own LCD panel, and all three images are combined at once. There is no colour wheel, so there is no rainbow effect that some viewers notice with single-chip projectors. Colourful diagrams and photos stay bright even when the picture contains a lot of white.

The projector has built-in Wi-Fi, and the manufacturer lists 802.11a/b/g/n/ac. The a and ac standards use the 5 GHz band, b and g use 2.4 GHz, and n works in both, so the projector can join a new or an older school network. No separate wireless module is needed, and there are fewer cables on the classroom desk.

The Epson EB-760W suits a classroom, lecture hall or meeting room where images are shown during the day and nobody wants to turn the lights off. 4100 ANSI lumens and 2,500,000:1 contrast keep slides readable, the 16:10 format matches a laptop screen, and built-in Wi-Fi connects to the school or office network.