Comparison
LH860ST vs GT3900UHD
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A side-by-side look at how the BenQ LH860ST and Optoma GT3900UHD 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 LH860ST and GT3900UHD
Buy LH860ST
Prices confirmed Nov 10, 2026 · we check every retailer daily
Buy GT3900UHD
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 | LH860ST | GT3900UHD |
|---|---|---|
| Resolution | 1080p (1920×1080) | 4K UHD (3840×2160) |
| Lumens | 5,000 ANSI | 4,000 (ISO 21118) |
| Picture Mode | Simulation mode (BenQ's golf site calls it Golf Mode) | Golf Mode |
| HDR | — | HDR10, HLG |
| Screen Size | — | 30–150 in (Optoma's page and datasheet) |
- ResolutionLH860ST1080p (1920×1080)GT3900UHD4K UHD (3840×2160)
- LumensLH860ST5,000 ANSIGT3900UHD4,000 (ISO 21118)
- Picture ModeLH860STSimulation mode (BenQ's golf site calls it Golf Mode)GT3900UHDGolf Mode
- HDRLH860ST—GT3900UHDHDR10, HLG
- Screen SizeLH860ST—GT3900UHD30–150 in (Optoma's page and datasheet)
Hardware
| Spec | LH860ST | GT3900UHD |
|---|---|---|
| Light Source | Laser (20,000 hours normal, 30,000 eco) | DuraCore laser (30,000 hours, eco) |
| Throw Ratio | 0.5:1 (fixed) | 0.496:1 (fixed) |
| Offset | 105% (±3%, BenQ's datasheet); no lens shift | 114% (±5%); no lens shift |
| Dimensions | 13.54 × 10.45 × 5.35 in (W × D × H) | 10.8 × 8.5 × 4.5 in (W × D × H, datasheet) |
- Light SourceLH860STLaser (20,000 hours normal, 30,000 eco)GT3900UHDDuraCore laser (30,000 hours, eco)
- Throw RatioLH860ST0.5:1 (fixed)GT3900UHD0.496:1 (fixed)
- OffsetLH860ST105% (±3%, BenQ's datasheet); no lens shiftGT3900UHD114% (±5%); no lens shift
- DimensionsLH860ST13.54 × 10.45 × 5.35 in (W × D × H)GT3900UHD10.8 × 8.5 × 4.5 in (W × D × H, datasheet)
Requirements
| Spec | LH860ST | GT3900UHD |
|---|---|---|
| Throw Distance | 100 in at about 3.6 ft (BenQ's manual) | 100 in at about 3.6 ft (Optoma's manual) |
- Throw DistanceLH860ST100 in at about 3.6 ft (BenQ's manual)GT3900UHD100 in at about 3.6 ft (Optoma's manual)
Performance
| Spec | LH860ST | GT3900UHD |
|---|---|---|
| Input Lag | 16.7 ms at 1080p/60Hz; 8.4 ms at 1080p/120Hz; 6 ms at 1080p/240Hz (BenQ) | As low as 4.3 ms at 1080p/240Hz (Optoma) |
- Input LagLH860ST16.7 ms at 1080p/60Hz; 8.4 ms at 1080p/120Hz; 6 ms at 1080p/240Hz (BenQ)GT3900UHDAs low as 4.3 ms at 1080p/240Hz (Optoma)
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 GT3900UHD
- Family Setup
4K for movies, low lag for games (4.3 ms at 1080p/240Hz, per Optoma) and a golf picture mode, for $1,499.
- Performance Seeker
4K detail at the tightest throw we list, with published low lag. 4,000 lumens wants some light control; a room with windows is better served by the brighter ZK521ST-B.
Both fit
- Space-Constrained
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