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White rectangular DLP projector with short-throw lens offset to one side, front-facing IR sensor, top control panel

OPTOMA

OPTOMA 4K400STx 4000-Lumen 4K UHD Short-Throw Business Projector

SKU CH-VSCS-JBPJC MPN 4K400STx

Projects bright 4K UHD images up to 300 inches from a short distance, with 4000 lumens and low 4.2 ms input lag for gaming

  • Projects 100-inch image from just over a meter
  • True 4K UHD 3840 x 2160 resolution with 8.3 million pixels
  • 4000-lumen brightness for clear visuals in ambient light
  • 1080p 240 Hz gaming with 4.2 ms input lag
  • Dual HDMI and USB-A power for flexible connectivity

True 4K UHD Short-Throw Projector

The OPTOMA 4K400STx is a new DLP projector built for classrooms and meeting rooms where space is limited. It delivers a native 3840 x 2160 resolution with 4000 lumens of brightness, producing clear images even when ambient light cannot be fully controlled. A short-throw lens allows a 100" image from just over a meter away, reducing presenter shadows.

Suited for Presenters in Tight Spaces

This model suits educators and professionals who need a large, bright display from a short distance and value simple connectivity via dual HDMI and USB-A power. It is less suited for buyers who need lens shift or optical zoom for flexible placement, or those requiring built-in smart operating systems and wireless casting without external devices.

Handles 300-Inch UHD and 1080p 240 Hz

The projector comfortably handles True 4K UHD content up to a 300" diagonal and supports 1080p at 240 Hz with a 4.2 ms input lag for responsive gaming. HDR and HLG support add depth to compatible sources, while sRGB and CMS tools aid colour accuracy. It runs out of headroom for screens beyond 300 inches and lacks native 4K high-refresh-rate input beyond the stated 1080p 240 Hz capability.

How it compares

Measured against everything we stock in Presentation Projectors, at today’s prices. Recalculated every night.

Price $2,440.99
Pricier than about 90% of the 608 comparable items (median $157.99).

Specifications

Size & build
Shipping weight4.68 kg
Package size394 × 375 × 165 mm

Questions about this item

Which source devices can I connect to the dual HDMI inputs on the 4K400STx?

Any device with an HDMI output — laptops, media players, game consoles or streaming sticks — will feed the projector's 3840 x 2160 native resolution.

Will my existing 1080p laptop work with the short-throw lens and 4.2 ms input lag?

Yes. The projector accepts 1080p signals up to 240 Hz, so a 1080p laptop will display correctly and benefit from the low 4.2 ms lag when gaming.

How can I verify the 4000-lumen brightness and True 4K UHD resolution are performing after installation?

Display a 3840 x 2160 test pattern and measure on-screen luminance with a calibrated meter; the result should approach the 4000-lumen rating in a dark room.

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