Optoma ZK431ST

Brand	Optoma
Type	Business
Released	June 2026
Resolution	4K UHD
Imaging technology	DLP
Light source	Laser (phosphor)
Claimed brightness (non-standard)	4,100 lm
Throw ratio	0.5:1
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms

A 4K UHD DLP laser projector for classrooms and meeting rooms, rated at 4,100 lumens. It has a fixed 0.496:1 short-throw lens, two HDMI 2.0 inputs, a 15 W speaker and a claimed 30,000-hour laser life.

Data sheet

Picture

Claimed brightness (non-standard)	4,100 lm
Brightness uniformity	75%
Imaging technology	DLP
Native aspect	16:9Derived
Addressable resolution	4K UHD (3840 × 2160)
Dynamic contrast	2,000,000:1
Gamma / EOTF presets	2.2, 2.4
3D	Yes
3D formats	Frame packing, Side-by-side, Top-bottom
3D glasses sync	DLP-Link

Light source

Light source	Laser (phosphor)
Light-source life	30,000 h eco

Optics

Throw ratio	0.5:1100″ · 1.10 m
Image size	30–300 in
Projection offset	114%
Zoom	None
Focal length	7.51 mm
Aperture (f-number)	2.8
Focus	Manual
Vertical keystone	15°
Horizontal keystone	15°
Corner correction	4-corner
Grid warp	Yes

Motion & gaming

Input lag

1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms

Inputs & control

HDMI inputs	2 × HDMI 2.0
Max input resolution	4K UHD
Control ports	RS-232, 12 V trigger

Smart platform

Ethernet

Yes

Audio

Speaker power	15 W
Speakers	1
Audio outputs	3.5 mm
HDMI audio return	NoneDerived

Physical & installation

Dimensions (W × D × H)	274 × 216 × 109 mm
Weight	2,900 g
Orientations	360°
Ceiling mount	M4, screws ≥ 10 mm

Environment & power

Operating temperature	0–40°C
Altitude	3,048 m
Power draw	Max 178 W · Eco 125 W
Standby	Up to 0.5 W
Power supply	External adapter
Mains input	100–240 V · 50/60 Hz
DC input	19.5 V
Fan noise	Normal 35 dB(A) · Eco 29 dB(A)

Safety & support

Laser class	Class 1
Risk group	RG2
Hazard distance	1 m
FDA laser notice	Notice 57
Marks	FCC
Warranty	🇺🇸 US 5 yr Third-party listing. Optoma's US warranty page (support.optomausa.com) is unreadable.

In the box

Power cord, Remote, Remote batteries, Quick start guide

Similar models

Model	Resolution	Tech	Lumens	Price
Epson Pro EX9270 1080p · 3LCD	1080p	3LCD	4,100	$999.99	Compare
Epson PowerLite 1290 1080p · 3LCD	1080p	3LCD	4,100	$986	Compare
Christie LW401 WXGA · 3LCD	WXGA	3LCD	4,000 −100	$1,699.99	Compare
NEC NP-M403H 1080p · DLP	1080p	DLP	4,000 −100	$2,599	Compare
NEC NP-P401W WXGA · 3LCD	WXGA	3LCD	4,000 −100	$1,799	Compare
Optoma EH412ST 1080p · DLP	1080p	DLP	4,000 −100	$930	Compare

Other

Tools

Throw calculator — How far from the screen the ZK431ST needs to sit for a given image size, set to its 0.496:1 lens.
Download spec as CSV — Every value on this data sheet with its unit and source, one row per spec.
Download spec as JSON — The same data from the open data API, with variants and identifiers.

Variants & identifiers

Use these to confirm a listing is this exact model. Any of them works at /p/{code}.

Variant	Region	Type	Code
Standard	🇺🇸 US	MPN	ZK431ST