Optoma EH412ST Full HD 1080p Short Throw Projector – 4000 Lumens, 4K HDR Input, 10W Speaker

The Optoma EH412ST is a 4,000-lumen Full HD short throw DLP projector for meeting rooms, classrooms, and training spaces. It throws a 120-inch image from just over four feet, accepts 4K HDR sources, and includes a 10W speaker, giving presenters a bright, detailed picture without standing in the beam.

Deep-Dive Story & Problem/Solution

Bright Rooms and Short Distances Defeat Ordinary Office Projectors

Meeting rooms are rarely dark. Blinds stay open, overhead lights stay on, and a 3,000-lumen projector turns charts into pale outlines. At the same time, many rooms are too shallow for a standard lens to fill the wall.

The EH412ST tackles both. A 245W lamp and 0.65-inch DLP chip produce 4,000 ANSI lumens, and the 0.50:1 lens needs only half the image width in distance. A projector on a short wall arm or front table fills a 120-inch screen while the presenter moves freely.

Full HD resolution gives roughly twice the pixel count of WXGA. Small fonts in financial models, engineering drawings, and dashboards remain legible, and the HDMI 2.0 input accepts 4K HDR signals from newer laptops and media players.

Short Throw Brightness for Lit Rooms

The 4,000-lumen output paired with a 50,000:1 contrast ratio keeps text edges crisp against white backgrounds. Image sizes from about 36 to 307 inches cover everything from a huddle space to a lecture room.

Built for Daily Shared Use

Lamp life reaches 15,000 hours in Eco mode. RS-232 control fits standard AV room systems, VGA out feeds a second display, and the sealed DLP engine needs no filter changes.

Setup Instructions

How to Install the Optoma EH412ST

1. Mount or place the projector about 4 to 5 feet from the screen for a 110 to 130-inch image.
2. Connect the room PC or a laptop to HDMI 2.0; use VGA for legacy devices.
3. Power on, sharpen with the focus ring, and correct any tilt with vertical keystone.
4. Pick Presentation mode for lit rooms or Cinema for video, and enable Eco lamp mode where full brightness is not required.