We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • Cabinet ColorWhite
  • TypeDLP
  • Brightness3600
  • Native Resolution4K UHD
  • Maximum Resolution3840 x 2160
  • Aspect Ratio16:9

Option 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.

Highlights

  • 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

Specifications

BrandOptoma
ModelUHD35STx
Cabinet ColorWhite
TypeDLP
Brightness3600
Native Resolution4K UHD
Maximum Resolution3840 x 2160
Aspect Ratio16:9
Contrast Ratio1,000,000:1
Display Size36.43" ~ 300.53" diagonal
Horizontal Refresh Rate31 ~ 135Khz
Vertical Refresh Rate24 ~ 120Hz
Focal Length7.51
Throw Ratio0.5:1
Throw Distance15.75" - 129.92"
LampLight source type Lamp
Lamp watts 240
Lamp LifeLamp life hours (up to) 4000 (Bright), 15000 (Dynamic), 10000 (Eco)
Input Video CompatibilityPC compatibility UHD, WQHD, WUXGA, FHD, UXGA, SXGA, WXGA, HD, XGA,
SVGA, VGA, Mac
2D compatibility 480i/p, 576i/p, 720p(50/60Hz), 1080i(50/60Hz),
1080p(50/60Hz), 2160p(50/60Hz)
3D compatibility Frame-pack: 1080p24, 720p50 / 60
3D Full 3D
Input Video Connectors2 x HDMI 2.0
Output Audio Connectors1 x Audio 3.5mm, 1 x S/PDIF
USBUSB-A power 1.5A
Other Connectors1 x RS232
Power Supply100 ~ 240V, 50 ~ 60Hz
Power ConsumptionPower consumption (standby) 0.5W
Power consumption (min) 220W
Power consumption (max) 320W
Temperature Range5°C~40°C/41°F~104°F, max altitude 3000M/9843ft, max
Humidity RangeMax. Humidity 85%
Noise LevelNoise level (min) 24dB
Noise level (max) 28dB
DimensionsDimensions (W x D x H) 12.4" x 10.63" x 4.65"
WeightGross weight 10.32 lbs
Net weight 7.72 lbs
Package Contentsn the box AC power cord
Remote control
2x AAA batteries
Basic user manual
Shipping weight4.68 kg
Package size394 × 375 × 165 mm

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.