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White short-throw DLP projector, compact rectangular form, front lens offset, top control panel

OPTOMA

OPTOMA UHD35STx 4K UHD Short Throw Business Projector 3600 Lumens 240Hz

SKU CH-623R-74PYE MPN UHD35STx

throw DLP projector delivers true 4K UHD at 3600 lumens with 240Hz refresh rate and 4.2ms input lag

  • Screen diagonal36.43 in ~ 300.53 in diagonal
  • Image brightness3600
  • Power draw(standby) 0.5 W Power consumption (min) 220 W Power consumpt
  • Panel resolution4K UHD
  • Highest resolution3840 × 2160
  • Screen ratio16:9

Model UHD35STx

  • True 4K UHD resolution delivers four times Full HD detail
  • Short throw lens projects a 100" image from just a few feet away
  • 3600 lumens brightness enables clear viewing with lights on
  • 240Hz refresh rate with 4.2ms input lag gives competitive gaming advantage
  • Lamp life up to 15000 hours in Dynamic mode reduces maintenance

True 4K UHD Short Throw Projection

The Optoma UHD35STx delivers a native 3840 x 2160 resolution using DLP technology with a 0.5:1 throw ratio. It produces a 100" diagonal image from a short distance and reaches 3600 lumens brightness for lights-on viewing. A 1,000,000:1 contrast ratio supports deep blacks and bright highlights.

Competitive Gamers and Living-Room Viewers

The 240Hz refresh rate at 1080p and 4.2ms input lag suit fast-paced gaming where motion clarity matters. HDR compatibility and 4K 60Hz at 16.9ms response time serve film and console play. Buyers needing 4K at 120Hz or advanced lens shift for complex installs should look elsewhere.

0.5:1 Throw Ratio and 100" Image Distance

A throw ratio of 0.5:1 means the projector sits roughly half the image width from the screen. This lets you fill a 100" diagonal from just a few feet away, avoiding shadows and fitting tight rooms. Verify your throw distance range of 15.75" to 129.92" matches the planned mounting position.

How it compares

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

Price $2,104.99
Pricier than about 90% of the 608 comparable items (median $157.99).
Screen diagonal 36.43 in ~ 300.53 in diagonal
Lower than about 74% of the 141 comparable items (median 110 in).

Specifications

Product
Brand nameOptoma
Model nameUHD35STx
Case colorWhite
Product typeDLP
Display
Screen diagonal36.43 in ~ 300.53 in diagonal
Image brightness3600
Panel resolution4K UHD
Highest resolution3840 × 2160
Screen ratio16:9
Contrast1,000,000:1
Horizontal scan rate31 to 135 kHz
Vertical frequency24 to 120 Hz
Projection ratio0.5:1
Projection distance15.75 in - 129.92 in
Light sourceLight source type Lamp
Lamp watts 240
Lamp lifespanHours (up to) 4000 (Bright), 15000 (Dynamic), 10000 (Eco)
Audio & video
Lens focal length7.51
Ports & slots
Video input typesPC compatibility UHD, WQHD, WUXGA, FHD, UXGA, SXGA, WXGA, HD, XGA,
SVGA, VGA, Mac
2D compatibility 480i/p, 576i/p, 720p(50/60 Hz), 1080i(50/60 Hz),
1080p(50/60 Hz), 2160p(50/60 Hz)
3D compatibility Frame-pack: 1080p24, 720p50 / 60
3D Full 3D
Video inputs2 x HDMI 2.0
Audio outputs1 x Audio 3.5 mm, 1 x S/PDIF
USB portsUSB-A power 1.5A
Power
Power draw(standby) 0.5 W
Power consumption (min) 220 W
Power consumption (max) 320 W
Power supply100 to 240 V, 50 to 60 Hz
Size & build
Product dimensions(W × D × H) 12.4 in × 10.63 in × 4.65 in
Product weightGross weight 10.32 lb
Net weight 7.72 lb
Shipping weight4.68 kg
Package size394 × 375 × 165 mm
In the box
In the boxn the box AC power cord
Remote control
2x AAA batteries
Basic user manual
Environment & compliance
Temperature range5 °C to 40 °C/41 °F to 104 °F, max altitude 3000M/9843 ft, max
Humidity limitsMax. Humidity 85%
Operating noise(min) 24 dB
Noise level (max) 28 dB

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Questions about this item

How do I mount the UHD35STx and set the 0.5:1 throw ratio for a 100" image?

Place the projector on a stable surface or ceiling mount with the lens 4–5 feet from the screen; the 0.5:1 ratio means a 100" diagonal image forms at roughly 50" throw distance. Use the 1.1× zoom and vertical keystone to square the picture — the step most people miss is re-checking focus after keystone adjustment.

What lamp replacement schedule should I expect with the 240 W lamp?

The lamp is rated up to 4,000 hours in Bright mode, 10,000 hours in Eco mode and 15,000 hours in Dynamic mode; plan a replacement when brightness drops noticeably or the lamp-warning indicator appears.

At what point does input lag become noticeable during long 240 Hz gaming sessions?

The projector maintains 4.2 ms lag at 1080p 240 Hz and 16.9 ms at 4K 60 Hz; sustained use does not increase these figures, so the first limit you hit will be the 120 Hz vertical refresh ceiling or lamp-life hours, not lag drift.

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