BenQ LK936ST vs Optoma ZK551
Bold marks the better figure where both are stated to the same standard. “—” means the manufacturer doesn't state it.
 BenQ LK936ST | Optoma ZK551 | |
|---|---|---|
| Display system | ||
| Imaging technology | DLP | DLP |
| Technology brand | DLP | — |
| Number of imaging devices | 1 | 1 |
| Native aspect ratio | 16:9 | 16:9 |
| Pixel shift | — | XPR 4-way |
| Addressable resolution | 3840 × 2160 | 3840 × 2160 |
| Optics | ||
| Throw ratio | 0.81–0.89:1 | 1.4–2.24:1 |
| Throw reference point | Lens | — |
| Projection distance table | 60″: 1.08–1.18 m · 80″: 1.44–1.58 m · 100″: 1.79–1.97 m · 120″: 2.15–2.36 m · 150″: 2.69–2.96 m · 200″: 3.59–3.94 m · 250″: 4.48–4.93 m · 300″: 5.38–5.91 m | 40″: 1.24–1.98 m · 60″: 1.86–2.98 m · 100″: 3.1–4.96 m · 145″: 4.49–7.19 m · 180″: 5.58–8.93 m |
| Zoom type | Optical | Optical |
| Zoom ratio | 1.1× | 1.6× |
| Focus | Manual | Manual |
| Vertical lens shift | ±60% | 102–117% |
| Horizontal lens shift | ±23% | — |
| Motorized lens shift | No | — |
| Fixed offset | — | 102% |
| Focal length | 8.6–9.4 mm | 20.91–32.62 mm |
| F-number | 1.83–1.86 | 2.5–3.26 |
| Interchangeable lens | — | No |
| Image size range | 30–300 in | 20–300 in |
| Vertical keystone | -40–40° | -30–30° |
| Horizontal keystone | -40–40° | -30–30° |
| Corner / warp correction | Warp | Warp |
| Light source | ||
| Light source type | Laser (phosphor) | Laser (phosphor) |
| Light source detail | Laser | DuraCore laser |
| Light source life | Normal: 20,000 h | Eco: 30,000 h |
| Constant brightness mode | — | Yes |
| Warm-up time | 30 s | — |
| Cool-down time | 90 s | 90 s |
| Brightness | ||
| ISO light output | — | 5,100 lm |
| ANSI lumens | 5,100 lm | — |
| Brightness uniformity (centre-to-corner) | — | 75% |
| Contrast & black level | ||
| Dynamic contrast | 3,000,000:1 | 3,000,000:1 |
| Colour | ||
| Rec.709 gamut | 92% | — |
| Gamut metric | Coverage | — |
| Gamma / EOTF presets | 2.2, 2.4, 2.6 | 2.2, 2.4 |
| Bit depth / 'number of colours' | 30 bit | — |
| Calibration & picture control | ||
| Colour management system | 6-axis | 6-axis |
| HDR | ||
| HDR formats | HDR10, HLG | — |
| Motion & gaming | ||
| Max refresh rate | — | 1920×1080: 240 Hz · 3840×2160: 60 Hz |
| Input lag (rated) | 1920×1080 @ 60 Hz: 16.7 ms · 3840×2160 @ 60 Hz: 16.7 ms | 1920×1080 @ 60 Hz: 17 ms · 1920×1080 @ 120 Hz: 8.6 ms · 1920×1080 @ 240 Hz: 4.4 ms · 3840×2160 @ 60 Hz: 17 ms |
| Audio | ||
| Speaker power | 10 W | 15 W |
| Speaker count | 1 | 1 |
| Audio channels | Mono | Mono |
| Dolby Atmos | Yes | — |
| Audio outputs | 3.5 mm, Optical, HDMI eARC | 3.5 mm |
| HDMI ARC | Yes | — |
| HDMI eARC | Yes | — |
| Inputs, control & connectivity | ||
| Max input signal | 3840 × 2160 | 3840 × 2160 |
| HDMI port count | 2 | 2 |
| HDMI ports (feature-level) | HDMI-1: HDMI 2.0b, HDCP 2.2; HDMI-2: HDMI 2.0b, HDCP 2.2, eARC | HDMI 1: HDMI 2.0, HDCP 2.3; HDMI 2: HDMI 2.0, HDCP 2.3 |
| Horizontal scan frequency | 15–135 kHz | 15–150 kHz |
| Vertical scan frequency | 23–240 Hz | 24–240 Hz |
| HDBaseT | Yes | — |
| RS-232 | Yes | Yes |
| LAN control | Yes | Yes |
| Wired IR input | Yes | — |
| 12 V trigger | Yes | Yes |
| PJLink class | — | Class 1 |
| Control ecosystem drivers | Crestron | Crestron |
| Ethernet | Yes | Yes |
| Firmware / software | ||
| Casting | — | Miracast |
| Update policy | — | Over-the-air (OTA) firmware updates |
| 3D | ||
| 3D support | Yes | Yes |
| 3D sync method | DLP-Link | DLP-Link |
| 3D formats | Frame sequential | Frame packing, Side-by-side, Top-bottom, Frame sequential |
| Glasses included | 0 | — |
| Setup automation | ||
| Auto keystone | Yes | — |
| Acoustic noise | ||
| Fan noise (sound pressure) | Typical: 40 dB(A) · Eco: 33 dB(A) | Min: 28 dB(A) · Max: 34 dB(A) |
| Environment & power | ||
| Operating temperature | 0–40°C | 0–40°C |
| Operating humidity | 10–90%RH | — |
| Altitude / high-altitude mode | 3,000 m | 3,048 m |
| High-altitude mode | Yes | Yes |
| Operating orientations | — | Table, Ceiling, Rear, Portrait, 360° |
| Rated voltage | 100–240 V | 100–240 V |
| Rated frequency | 50–60 Hz | 50–60 Hz |
| Power consumption (max) | 520 W | 245 W |
| Power consumption by mode | Typical: 440 W | Eco 110v: 170 W · Eco 220v: 168 W · Bright 110v: 245 W · Bright 220v: 240 W |
| Standby power | 0.5 W | 0.5 W |
| Networked standby power | 2 W | — |
| Power supply | — | External brickPreliminary |
| Physical & installation | ||
| Width | 416 mm | 274 mm |
| Depth | 351 mm | 216 mm |
| Height | 166 mm | 114 mm |
| Weight | 7 kg | 3.5 kg |
| Ingress protection | IP5X | IP6XPreliminary |
| Mount hole pattern | — | Screw: M4*10mm |
| Sealed optical engine | Yes | — |
| Air filter | None | — |
| Safety & compliance | ||
| Photobiological risk group | RG2 | RG2 |
| Laser product class | Class 1 | Class 1 (consumer laser product), Risk Group 2 |
| Safety & market certifications | — | FCC |
| Support & ownership | ||
| Warranty | 🇺🇸 US 3 yr | — |
| User manual | https://esupportdownload.benq.com/esupport/PROJECTOR%20FOR%20BUSINESS/UserManual/LK936ST/LK936ST_UM_EN_241101130452.pdf | https://region-resource.optoma.com/products/documents/K5mU9Peeq4zSbamp55pR5XFag9nk3bx7MMN5DCWz.pdf |
| In the box | ||
| Box contents | Projector, Remote, Batteries, Installation guide, Regulatory statements, Warranty card, Power cord, Hdmi cable | Power cord, Remote, Batteries, Quick start guide |
| Remote type | — | IR |