BenQ · 3,000–4,999 lumens · 4K
BenQ LK830ST
4,000lumens
3840×2160native
0.5–0.5throw ratio
3.6 kgweight
The BenQ LK830ST is a DLP x 1 projector rated at 4,000 lumens with a native resolution of 3840×2160. It uses a laser phosphor light source rated for 20,000 hours / 30,000 hours (Eco). Its lens has a throw ratio of 0.5:1. Released September 2025.
Throw distance table
Distance from lens to surface for each image width (16:9 (4K HD)). Calculated as throw ratio × width; check the manufacturer's lens calculator before installation.
| Image width | Height | Standard lens 0.5:1 |
|---|---|---|
| 2 m (6.6 ft) | 1.12 m | 1.0 m |
| 3 m (9.8 ft) | 1.69 m | 1.5 m |
| 4 m (13.1 ft) | 2.25 m | 2.0 m |
| 5 m (16.4 ft) | 2.81 m | 2.5 m |
| 6 m (19.7 ft) | 3.38 m | 3.0 m |
| 8 m (26.2 ft) | 4.5 m | 4.0 m |
| 10 m (32.8 ft) | 5.62 m | 5.0 m |
| 12 m (39.4 ft) | 6.75 m | 6.0 m |
| 15 m (49.2 ft) | 8.44 m | 7.5 m |
| 20 m (65.6 ft) | 11.25 m | 10.0 m |
| 25 m (82.0 ft) | 14.06 m | 12.5 m |
| 30 m (98.4 ft) | 16.88 m | 15.0 m |
Open in the throw-distance calculator →
Maximum image size for projection mapping
Largest image that keeps a 10:1 contrast against ambient light on a light, matte surface (80% optical efficiency). See how this is calculated.
| Ambient light | Max area | Max width × height |
|---|---|---|
| Dark rural site (1 lux) | 356 m² | 25.1 × 14.1 m |
| Quiet street at night (5 lux) | 71 m² | 11.2 × 6.3 m |
| Lit city square (15 lux) | 24 m² | 6.5 × 3.7 m |
| Bright urban area (30 lux) | 12 m² | 4.6 × 2.6 m |
| Indoor, lights dimmed (50 lux) | 7 m² | 3.6 × 2.0 m |
Full specifications
| 3D Modes | Full HD 3D |
|---|---|
| Aspect Ratio | 16:9 (4K HD) |
| Audible Noise | 30 dB / 24 dB (Eco) |
| Awards | #8 in Popular Classroom Projectors for Schools 2026 |
| Best Used For | K-12 Education Higher Education Corporate/Business Golf Simulator |
| Brightness | 4,000 Lumens (ANSI) 1 |
| Color Processing | 10-bit |
| Connection Panel | Audio Out: Mini Jack HDMI 2.0 (HDCP 2.2) x 2 Network: RJ-45 RGB In: BNC USB: A x 2 |
| Data Modes | MAX 3840x2160 |
| Digital Keystone | Horizontal & Vertical |
| Digital Zoom | Yes |
| Display Type | DLP x 1 |
| Features | Short-Throw Full HD 3D Edge Blending Geometric Correction HDR HDMI CEC |
| Image Size | 69.95" - 300.07" |
| Included Lens | Fixed focal length , manual focus |
| Input Lag | 1080p/60: 16.7ms |
| Internal Speakers | 15.0 Watts Mono |
| Lens Shift | No |
| Light Source | Laser Phosphor |
| Light Source Life | 20,000 hours / 30,000 hours (Eco) |
| MSRP | $2,499 (USD) |
| Power | 230 Watts 100V - 240V |
| Projector Size | 4.74" x 10.99" x 9.03" (HxWxD) |
| Released | September 2025 |
| Resolution | 3840x2160 |
| Status | Shipping |
| Street Price | $2,499 (USD) |
| Throw Distance | 2.5' - 10.8' Calculate Throw Distance |
| Throw Ratio | 0.50:1 (D:W) |
| Video Modes | 720p, 1080i, 1080p/60 |
| Weight | 7.9 lbs |
Specifications compiled from ProjectorCentral and manufacturer data. Prices change — verify with dealers.
Similar projectors
| Model | Lumens | Resolution | Light source | Throw ratio | Street price |
|---|---|---|---|---|---|
| BenQ AK700ST | 4,000 | 3840×2160 | Laser/LED Hybrid | 0.69–0.83:1 | $2,899 |
| Optoma GT3900UHD | 4,000 | 3840×2160 | Laser Phosphor | 0.5:1 | $1,499 |
| Optoma UHZ66 | 4,000 | 3840×2160 | Laser Phosphor | 1.4–2.24:1 | $1,895 |
| ViewSonic PX749-4K | 4,000 | 3840×2160 | 240W UHP bulb | 1.13–1.47:1 | $1,200 |
| InFocus Orbital IN0061SL | 4,000 | 3840×2160 | UHP bulb | 1.21–1.59:1 | $1,051 |
| Optoma 4K400STx | 4,000 | 3840×2160 | 240W Metal Halide bulb | 0.5:1 | $1,999 |
| Optoma 4K400x | 4,000 | 3840×2160 | 240W Metal Halide bulb | 1.5–1.66:1 | $1,424 |
| Optoma GT4000UHD | 4,000 | 3840×2160 | Laser Phosphor | 0.25:1 | $3,499 |