Your room is too short for the standard short throw setup. Or your ceiling is too low. Or you want to mount the projector on the floor inside the enclosure so there are no cables running across your ceiling.
That’s the ultra short throw (UST) use case.
Short throw projectors like the BenQ AK700ST ($2,899) need 5-7 feet of projection distance for a 120-inch screen. That’s fine for a 16-foot garage. But when your room is 12 feet deep, or your ceiling joists won’t cooperate, or you just don’t want to drill into your ceiling, UST is the answer.
The UST category — defined by throw ratios of 0.49:1 to 0.55:1 — lets you place the projector close enough to the screen that you can floor-mount it inside the enclosure base. The golfer stands behind or beside it. No shadows. No ceiling mount. No exposed cables. The projector is just part of the enclosure frame.
This guide covers the UST projectors that actually work in a sim build. True 4K and 1080p. Laser only (lamp UST is dead in 2026). And every pick is backed by verified pricing and real-world owner reports.
If you’re not sure whether UST is right for your space, start with our main projector guide — it covers all throw ratios across every budget. The space requirements guide will tell you exactly what fits your room.
What Makes Ultra Short Throw Different
The whole point of UST is the throw ratio. A 0.496:1 throw means the projector sits 4.3 feet from the screen to fill 120 inches diagonal. A standard short throw at 0.69:1 needs 6 feet for the same image. In a 12-foot room, that 1.7-foot difference is the margin between a working setup and a failed install.
Three things UST unlocks that short throw cannot:
Floor mounting inside the enclosure. This is the biggest practical advantage. The LK830ST weighs 7.5 pounds and fits on a shelf mounted to the enclosure base frame. You run a single HDMI cable along the enclosure frame to your PC. No ceiling drilling. No conduit. No ladder work. The projector sits 2-3 feet off the ground, pointed upward at the screen.
Zero shadow risk. With the projector on the floor or a low shelf, your body is never between the light path and the screen. Even with a standard short throw ceiling-mounted at 7 feet, a tall golfer can cast shoulder shadows on the follow-through. UST eliminates this entirely.
Rooms under 13 feet deep. This is the hard constraint. If your room measures 11-13 feet from wall to wall, a standard short throw projector cannot fill a 10-foot screen without the golfer standing directly in the light path. UST fits. The LK830ST fills a 100-inch screen from 3.6 feet, a 120-inch from 4.3 feet. In an 11-foot room, that leaves 6-7 feet of swing space behind the projector.
The tradeoff is installation precision. UST projectors have fixed lenses — no zoom, no lens shift. You mount at exactly the right distance and that’s where it lives. The LK830ST has digital Corner Fit and 2D keystone for fine-tuning, but the primary alignment is mechanical: measure once, drill once, get it right.
The Ultra Short Throw Lineup
There are exactly seven UST projectors worth considering for a home golf sim in 2026. I’ve organized them by what they do best — not by price, not by brand loyalty.
BenQ LK830ST — $2,499 (Best Overall UST)
4K UHD. 4,000 lumens. 0.496:1 fixed UST. Laser (20K hrs / 30K eco). IP6X. Screen Fill. Golf Mode. 15W speaker. 4.2ms input lag (1080p/240Hz).
This is the projector that solves the tight-room problem in 4K. The LK830ST delivers the same 4K UHD resolution and 4,000-lumen brightness as the AK700ST, but in a UST chassis that sits 4.3 feet from a 120-inch screen.
The 0.496:1 throw ratio is the headline, but Screen Fill technology is the feature you don’t know you need until you’ve spent 20 minutes on a ladder adjusting keystone. Screen Fill switches the native resolution to match your screen aspect ratio — 16:9, 4:3, 16:10, 1:1, or 5:4 — with one button press. In a sim build where screens come in every aspect ratio, this eliminates the most common alignment headache.
BenQ’s exclusive Golf Mode color profile corrects the purple-fringed skies and oversaturated greens that plague standard picture modes on sim software. It’s calibrated specifically for the color palette of GSPro, E6 Connect, and TGC 2019. Out of the box, fairways look natural, skies look blue, and bunkers look like sand instead of yellow mush.
The IP6X dust protection is meaningful for floor-mounted installs. Floor-mounting puts the projector closer to garage floor dust. The sealed optical engine means zero filter cleaning over the projector’s 20,000-hour life.
The tradeoff: no zoom, no lens shift. You measure, mount, and live with the result. Corner Fit and 2D keystone give you digital wiggle room, but the primary alignment is physical. Budget an afternoon for installation and don’t rush the measurements.
Who it’s for: The guy with a room under 13 feet deep who wants 4K without compromise. The floor-mount builder who wants zero ceiling work. The golfer who values Screen Fill aspect switching over motorized zoom.
Who should skip it: Anyone who wants zoom flexibility or lens shift — get the AK700ST or UHZ35ST instead. Anyone on a strict under-$2,000 budget.
Optoma UHZ36STe — ~$1,699 (Value 4K UST)
4K UHD. 4,000 lumens. 0.496:1 fixed UST. Laser (30,000 hrs). IP6X. Golf SIM mode. HDR10+HLG. 4.4ms input lag (1080p/240Hz).
This is the projector that changed the 4K UST conversation in 2026. The UHZ36STe delivers genuine 4K UHD at 4,000 lumens with a 0.496:1 UST throw, IP6X dust sealing, a dedicated Golf SIM picture mode, and a 30,000-hour DuraCore laser — for roughly $800 less than the LK830ST.
The marketing says the LK830ST is the only 4K UST purpose-built for golf sims. The truth is the UHZ36STe does the same resolution, comparable brightness, better laser life (30,000 vs 20,000 hours), and the same IP6X dust protection — and it costs $1,699 instead of $2,499.
The Golf SIM picture mode is purpose-built for sim course graphics. Lighter blue skies, darker shadows, more realistic green tones. HDR10+HLG support handles high-dynamic-range content for movies and sports. The 4.4ms input lag at 1080p/240Hz is the lowest in this class.
The tradeoffs versus the LK830ST: no Screen Fill aspect switching, no dedicated Golf Mode (it has a Golf SIM mode but it’s less refined than BenQ’s), and no BenQ ecosystem support. The 30,000-hour laser life is longer, but the overall build quality feels commercial-grade rather than premium.
Who it’s for: The buyer who wants 4K UST without spending $2,500. The value play of 2026.
Who should skip it: Anyone who needs Screen Fill for non-16:9 screens. Anyone who prefers BenQ’s Golf Mode color tuning.
Optoma UHZ35ST — $2,199 (Best 4K UST with Lens Shift)
4K UHD. 3,500 lumens. 0.496:1 fixed UST. Laser (30,000 hrs). IP6X. Vertical lens shift. Golf SIM mode. HDR10+HLG.
This is the projector that gives you something no other compact UST offers: optical vertical lens shift. At $2,199, that feature alone justifies the premium over the UHZ36STe.
Lens shift means you mount the projector and adjust the image position by turning a dial. No keystone distortion. No digital correction. No “close enough” on a ladder. You dial in pixel-perfect alignment from a seated position. For a UST projector where the fixed throw already demands precise mounting, lens shift is the safety net that saves you from re-drilling holes.
The tradeoff: 3,500 lumens instead of 4,000 on the UHZ36STe. In a dark sim room, 3,500 is fine. In a garage with lights on, you’ll notice the difference. The 500,000:1 contrast ratio is the highest in Optoma’s compact lineup — deeper blacks, richer greens on the virtual fairway.
The 1-year warranty is shorter than the ZK430ST’s 3-year term. For a ceiling-mounted projector that stays in place for years, the warranty difference matters.
Who it’s for: The guy who wants 4K UST with the easiest possible installation. The lens shift alone is worth the price.
Who should skip it: Bright garage builders. Anyone who prioritizes warranty length over installation convenience.
Optoma ZK430ST — $2,299 (Best Bright Compact 4K UST)
4K UHD. 3,700 lumens. 0.496:1 fixed UST. Laser (30,000 hrs). IP6X. 3-year warranty. HDR10/HLG.
The brightest compact 4K laser UST on the market. 3,700 lumens in a 6.6-pound chassis. Same 0.496:1 throw as the UHZ35ST. Same DuraCore laser with 30,000 hours. Same Golf SIM Picture Mode.
The differences from the UHZ35ST: 200 more lumens (3,700 vs 3,500), no lens shift, 3-year warranty instead of 1-year. The lens shift vs warranty decision is the core trade. If installation ease matters, get the UHZ35ST. If long-term reliability and brightness matter, get the ZK430ST.
Who it’s for: Garage builders who want the brightest compact 4K UST. Anyone who values a 3-year warranty.
Who should skip it: Installers who want lens shift. The UHZ35ST is $100 less and has it.
BenQ AH500ST — $1,999 (Value 1080p UST Laser)
1080p. 4,000 lumens. 0.499:1 fixed UST. Laser (38,000 hrs eco). IP5X. Screen Fill. No Auto Screen Fit.
This is BenQ’s value-tier UST laser. At $1,999, it delivers the longest Eco laser life in the entire BenQ golf lineup (38,000 hours — 52 years at 2 hours a day) and a true UST 0.499:1 throw.
Screen Fill works on this model, letting you switch aspect ratios with one button press. The fixed 0.499 throw fills a 120-inch screen from 4.4 feet. If your room is shallow, this is the projector that fits.
The tradeoff: 1080p (not 4K), no Auto Screen Fit, 83% Rec.709 color (vs 95% on the AH700ST short throw), and IP5X instead of IP6X dust protection. The 4,000 lumens are real and bright enough for garages, but the image quality gap between 1080p and 4K on a 120-inch screen is noticeable.
Who it’s for: The guy who wants BenQ UST laser at the lowest price. Rooms shorter than 13 feet where 4K isn’t in the budget.
Who should skip it: Anyone who sits close enough to a 120-inch screen to see 1080p pixels. Anyone who wants 4K.
Optoma GT2400HDR — $1,299 (Budget UST Champion)
1080p. 4,200 lumens. 0.496:1 fixed UST. Laser (30,000 hrs). IP6X. Golf SIM mode. HDR10. 8.4ms input lag (1080p/120Hz).
This is the projector that changes the budget UST conversation. At $1,299, the GT2400HDR delivers more lumens (4,200) than any BenQ UST under $2,500, better dust protection (IP6X vs IP5X on the AH500ST), a longer laser life (30,000 hours), and the same 0.496 UST throw.
It’s 1080p. That’s the tradeoff. But at 4,200 lumens in a garage, the brighter 1080p image beats a dimmer 4K image every single time. The Golf SIM picture mode, HDR10 support, and 8.4ms input lag make it purpose-built for sims.
The IP6X dust protection is best-in-class at this price. The DuraCore laser runs 30,000 hours maintenance-free. The 4,200 lumens are the brightest in the entire UST category under $2,000.
Who it’s for: Anyone building a sim who wants the best UST value in 2026. Garage builders who need brightness more than resolution.
Who should skip it: 4K purists. Anyone who wants Screen Fill or Auto Screen Fit.
Read our full Optoma GT2400HDR review →.
Optoma GT2000HDR — $999-1,199 (Entry UST Laser)
1080p. 3,500 lumens. 0.496:1 fixed UST. Laser (30,000 hrs). IP6X. HDR10+HLG. Golf SIM mode.
The cheapest way to get a UST laser projector with IP6X dust protection into your sim build. At $999-1,199, this is laser tech at the same price as 4LED alternatives, but with a sealed optical engine that shrugs off garage dust.
The tradeoff for that price: 3,500 lumens instead of 4,200 on the GT2400HDR. In a dedicated sim room with controlled light, 3,500 is plenty. In a bright garage, you’ll see the difference.
Same 0.496 UST throw as every other Optoma GT series. Same IP6X dust protection. Same 30,000-hour DuraCore laser life. Same Golf SIM Picture Mode.
Who it’s for: Budget builders who want laser reliability at the lowest possible entry price.
Who should skip it: Bright garage builders. Anyone with the extra $100-300 for the GT2400HDR’s 700 extra lumens.
For the full Optoma lineup breakdown, see our Optoma projector guide →.
Honorable Mentions
BenQ AH30ST ($1,499): BenQ’s entry-level UST with 3,200 lumens and 0.49:1 throw. LED light source (30,000 hours). Screen Fill is included. The 3,200 lumens are the lowest in this guide — fine for dark rooms, not enough for garages with lights on. If your budget is exactly $1,500 and you want BenQ UST, this is it. Otherwise, the $999-1,299 Optoma options offer better brightness and dust protection.
Optoma ZK521ST (~$2,999): 5,000 lumens of 4K UST with IP6X and 30,000-hour laser. This is commercial-grade brightness for large screens or spaces with unavoidable ambient light. Overkill for home builds unless your room has floor-to-ceiling windows. Read about it in our main projector guide.
BenQ LK936ST ($4,899): 5,100 lumens of 4K with a 0.81-0.89 throw. This is NOT a UST — it’s a short throw with lens shift that’s often confused with UST because of BenQ’s naming. If you’re spending $4,899 on a projector, you know what you need. Covered in our best 4K projector guide.
What to Avoid
LG ProBeam BU53RG ($3,799): This is NOT an ultra short throw projector. Its 0.94:1 throw ratio is mid-range short throw, requiring 8+ feet for a 120-inch screen. It’s a great projector in its category, but calling it UST is marketing confusion. If you need a true UST, this isn’t it. Covered in our main projector guide.
Epson LS12000 ($3,999): Standard throw (1.35-2.84:1). Requires 12+ feet for a 120-inch screen. Wrong for any sim build under 20 feet deep. Wrong for UST buyers entirely.
Optoma UHZ55 ($2,499): Standard throw (1.21-1.59:1). Same problem as the LS12000 — needs 10+ feet of projection distance. Not UST. Not viable for tight rooms.
Any lamp-based projector: In 2026, you should not be buying a lamp projector for a golf sim. The TH671ST ($799) is the last lamp holdout, and even that is fading. UST lasers start at $999. The price gap is dead. Buy laser.
FAQ
What throw ratio qualifies as ultra short throw for golf sims?
Anything at or below 0.55:1. The practical standard is 0.496:1 — every major UST projector (BenQ LK830ST, Optoma UHZ36STe, Optoma GT2400HDR) uses this ratio. It fills a 120-inch screen from approximately 4.3 feet. For comparison, short throw is 0.69-0.83:1 (5-7 feet for 120“), and standard throw is 1.2+ (10+ feet).
Can I floor-mount a UST projector?
Yes. This is the primary advantage of UST for sim builders. The LK830ST weighs 7.5 pounds and measures 11 x 4.8 x 9 inches. You can mount it on a shelf attached to the enclosure base frame, pointed upward at the screen. The short throw means the light path clears the golfer’s body entirely. No shadows, no ceiling drilling, no exposed cables. The Optoma GT2400HDR and UHZ36STe are even smaller at 6.6 pounds.
Does UST work with GSPro, E6, and other sim software?
Yes. Every projector in this guide connects via HDMI 2.0 and works with GSPro, E6 Connect, TGC 2019, Awesome Golf, Creative Golf 3D, and Foresight FSX. The projector is a display device — any PC-based sim software will work. BenQ’s Screen Fill (LK830ST, AH500ST) handles non-16:9 aspect ratios natively, which is helpful for 4:3 impact screens.
How much room depth do I need for a UST projector?
The LK830ST fills a 100-inch screen from 3.6 feet, a 120-inch from 4.3 feet. In an 11-foot room, you place the projector at 4 feet from the screen, giving you 7 feet for the golfer and swing behind it. In a 13-foot room, you have 9 feet of swing space. This is dramatically better than short throw, which needs 5-7 feet and leaves only 6-8 feet for the swing in a 13-foot room — tight for anyone over 6 feet tall.
Is 4K worth it for a UST projector?
On screens 100 inches and larger, yes. The difference between 4K and 1080p on a 120-inch screen is visible in course graphics, green textures, and data overlay readability. If your total sim budget is over $5,000, get the LK830ST or UHZ36STe. If your budget is under $5,000 total, spend the extra money on a better launch monitor or software and get the GT2400HDR — 4,200 lumens of 1080p looks excellent on a 100-120 inch screen.
What’s the difference between UST and short throw?
UST (0.49-0.55:1) sits 3.6-4.3 feet from the screen. Short throw (0.69-0.83:1) sits 5-7 feet. UST enables floor mounting inside the enclosure. Short throw requires ceiling mounting. UST works in rooms under 13 feet deep. Short throw needs 14-17 feet. UST has fixed lenses (no zoom). Short throw often has zoom and lens shift. The best choice depends entirely on your room dimensions.
The Bottom Line
If your room is under 13 feet deep, you need UST. If you can ceiling-mount and have 14+ feet of depth, get the AK700ST from our main projector guide for the zoom flexibility and Auto Screen Fit.
For the UST buyer:
The BenQ LK830ST ($2,499) is the best overall pick. 4K UHD, 4,000 lumens, Screen Fill, Golf Mode, IP6X dust protection, and the tightest 0.496:1 throw in BenQ’s 4K lineup. It’s the UST projector that delivers everything the AK700ST does, optimized for the shortest possible throw distance. If your room forces you into UST and you want the best, this is it.
The Optoma UHZ36STe ($1,699) is the value 4K pick. Same resolution, same brightness, same throw ratio, longer laser life, $800 less. No Screen Fill. No BenQ Golf Mode. But for $1,699, you’re getting 4K UST laser with IP6X and a dedicated Golf SIM picture mode. That’s the best deal in 4K UST in 2026.
The Optoma GT2400HDR ($1,299) is the budget champion. 1080p at 4,200 lumens with IP6X dust protection and 30,000-hour laser. It’s the brightest projector under $1,500 and the right choice when brightness matters more than resolution. Read our full review → before buying.
Related guides: Best projector for golf simulator · Best 4K projector for golf simulator · Best BenQ projector for golf simulator · Best laser projector for golf simulator · Best projector for garage golf simulator · Golf simulator space requirements · BenQ AK700ST review · Optoma GT2400HDR review · Optoma projector guide