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- LK835ST vs 4K400STx
BenQ LK835ST vs Optoma 4K400STx
What LK835ST does better (3) and where 4K400STx wins (2) — every spec side by side.
Why is LK835ST better than 4K400STx?
- Light source life20,000 h vs 4,000 h5×
- Contrast ratio (dynamic / claimed)3,000,000:1 vs 1,000,000:13×
- Weight3.4 kg vs 3.9 kg+15%
Why is 4K400STx better than LK835ST?
- Largest image size120″ vs 300″2.5×
- Fan noise34 dB vs 28 dB+21%
Specifications
Side by side
| Picture | ||
| Resolution (on screen) | 3840 × 2160 (4K UHD) | 3840 × 2160 (4K UHD) |
| Native panel resolution | 1920 × 1080 (Full HD) | 1920 × 1080 (Full HD) |
| 4K method | 4K by pixel shifting | 4K by pixel shifting |
| Display technology | DLP | DLP |
| Light source | Laser | — |
| Brightness (ANSI / ISO lumens) | 4,000 lm | 4,000 lm |
| Contrast ratio (dynamic / claimed) | 3,000,000:1 | 1,000,000:1 |
| HDR support | — | Yes |
| Motion interpolation (MEMC) | — | Yes |
| 3D playback | — | Yes |
| Gaming | ||
| Maximum refresh rate | 120 Hz | 120 Hz |
| Game / low-latency mode | — | Yes |
| Lens & placement | ||
| Throw ratio | 0.69:1 | 0.5:1 |
| Throw ratio (zoomed in) | 0.83:1 | — |
| Throw type | Short throw (0.4–1.0:1) | Short throw (0.4–1.0:1) |
| Distance for a 100″ 16:9 image | 1.53 m | 1.11 m |
| Smallest image size | 60″ | 33″ |
| Largest image size | 120″ | 300″ |
| Optical zoom | 1.25× | — |
| Lens shift | None | None |
| Autofocus | Yes | — |
| Keystone correction | Yes | Yes |
| Automatic keystone correction | No | No |
| Sound | ||
| Built-in speakers (total output) | 10 W | 10 W |
| Smart & streaming | ||
| Wi-Fi | Yes | — |
| Connectivity | ||
| HDMI inputs | 2 | 2 |
| HDMI version | — | 2 |
| USB port | Yes | Yes |
| Ethernet (LAN) | No | No |
| VGA input | No | No |
| Audio output | Yes | Yes |
| Battery, power & lifetime | ||
| Power consumption | 320 W | 320 W |
| Light source life | 20,000 h | 4,000 h |
| Light source life (eco mode) | — | 15,000 h |
| Design & noise | ||
| Fan noise | 34 dB | 28 dB |
| Fan noise (eco mode) | 28 dB | 24 dB |
| Weight | 3.4 kg | 3.9 kg |
| Width | — | 315 mm |
| Height | — | 118 mm |
| Depth | — | 270 mm |
| Colours | Black | White |
