Casio 4K Ultra HD Projector
XJ-L8300HN
http://www.casio.com/products/projectors/4k-hd-projectors/xj-l8300hn
This new lamp-free model features 5000 lumens brightness, with potential for advanced image-processing tech and high-speed switching of more than 4 million DMD (digital micromirror devices) with the installation of a DLP chip. The ability to project 8.3 M pixels and achieve 4K Ultra HD res will paint a pretty picture on any classroom wall.
Sony True 4K UHD
VPL-VW285ES
https://www.sony.com/electronics/projector/vpl-vw285es
This Sony 4K offers great lifelike picture resolution, more than four times Full HD, with 8.8milliin pixels. The tech boosts visibility with 1500 lumens via an ultra-high pressure long life lamp, and includes Motionflow tech to keep fast action smooth.
Digital Projection
7,500 Lumen E-Vision Laser 4K-UHD
http://www.digitalprojection.com/dp-projectors/e-vision-laser-4k-uhd/
Launched at ISE 2017, this new Digital Projection model expands the 3D-capable E-Vision range, offering picture in picture (PIP) as well as edge-blending and geometry correction as standard, alongside a real-time clock for automation. This single chip DLP adds a 7,500 lumens option with 4K resolution.