Comparison
LK830ST vs UHZ35ST
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A side-by-side look at how the BenQ LK830ST and Optoma UHZ35ST compare on specs, accuracy, room requirements, and price. No hype — just the parts of the decision a buyer actually weighs.
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More comparisons with the LK830ST and UHZ35ST
Buy LK830ST
Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy UHZ35ST
Prices confirmed Nov 10, 2026 · we check every retailer daily
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Full specificationsEvery spec for both, line by line
Specifications
The numbers, lined up.
Image
| Spec | LK830ST | UHZ35ST |
|---|---|---|
| Resolution | 4K UHD (3840×2160) | True 4K (3840×2160) |
| Lumens | 4,000 ANSI | 3,500 (standard not stated) |
| Picture Mode | Golf picture mode | Golf Sim preset |
| HDR | — | HDR10, HLG |
- ResolutionLK830ST4K UHD (3840×2160)UHZ35STTrue 4K (3840×2160)
- LumensLK830ST4,000 ANSIUHZ35ST3,500 (standard not stated)
- Picture ModeLK830STGolf picture modeUHZ35STGolf Sim preset
- HDRLK830ST—UHZ35STHDR10, HLG
Hardware
| Spec | LK830ST | UHZ35ST |
|---|---|---|
| Light Source | Laser (20,000 hours normal, 30,000 eco) | Laser (30,000 hours) |
| Throw Ratio | 0.496:1 (fixed) | 0.496:1 (fixed) |
| Offset | 114%; no lens shift | — |
| Dimensions | 10.99 × 9.03 × 4.74 in (W × D × H) | — |
| Fan Noise | — | 28–35 dB (Optoma spec) |
- Light SourceLK830STLaser (20,000 hours normal, 30,000 eco)UHZ35STLaser (30,000 hours)
- Throw RatioLK830ST0.496:1 (fixed)UHZ35ST0.496:1 (fixed)
- OffsetLK830ST114%; no lens shiftUHZ35ST—
- DimensionsLK830ST10.99 × 9.03 × 4.74 in (W × D × H)UHZ35ST—
- Fan NoiseLK830ST—UHZ35ST28–35 dB (Optoma spec)
Requirements
| Spec | LK830ST | UHZ35ST |
|---|---|---|
| Throw Distance | 100 in at about 3.6 ft (BenQ's manual) | — |
- Throw DistanceLK830ST100 in at about 3.6 ft (BenQ's manual)UHZ35ST—
Performance
| Spec | LK830ST | UHZ35ST |
|---|---|---|
| Input Lag | 16.7 ms at 4K/60Hz; 8.3 ms at 1080p/120Hz; 4.2 ms at 1080p/240Hz (BenQ) | 17 ms at 4K/60; 4.4 ms at 1080p/240Hz (Optoma's spec table says 16 ms at 4K/60, its feature list and datasheet 17 ms; the higher is used) |
- Input LagLK830ST16.7 ms at 4K/60Hz; 8.3 ms at 1080p/120Hz; 4.2 ms at 1080p/240Hz (BenQ)UHZ35ST17 ms at 4K/60; 4.4 ms at 1080p/240Hz (Optoma's spec table says 16 ms at 4K/60, its feature list and datasheet 17 ms; the higher is used)
Room planner
See each one in your sim room.
The planner draws each unit to scale with your room and your swing: where it mounts, the throw it needs, and whether your shadow crosses the light. Put in your room once, then switch units in the planner to compare.
Persona fitWho each one is better for
Who each one is better for
Honest persona fit, side by side.
Better for UHZ35ST
- Performance Seeker
Low input lag (about 17 ms at 4K/60, level with the TK710STi) and a 30,000-hour laser. At 3,500 lumens it is dimmer than the GT3900UHD and ZK431ST-B, which both cost less.
- Family Setup
4.4 ms at 1080p/240Hz for fast games, 4K for movies, and a Golf Sim preset. The GT3900UHD offers the same low 240Hz lag (4.3 ms) and a golf mode for $700 less.
- Space-Constrained
0.496 fixed throw — a 100-inch image from about 3.6 ft — fits tight rooms; same throw geometry as the GT2400HDR and AH500ST but in 4K.
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