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- LK935 vs 4K550ST
BenQ LK935 vs Optoma 4K550ST
What LK935 does better (4) and where 4K550ST wins (4) — every spec side by side.
Dimensions
Size comparison
LK9354K550ST
| LK935 | 4K550ST | Difference | |
|---|---|---|---|
| Height | 166 mm | 129 mm | +37 mm |
| Width | 416 mm | 392 mm | +24 mm |
| Depth | 351 mm | 281 mm | +70 mm |
| Weight | 7 kg | 5.9 kg | +1.1 kg |
Drawn to the same scale from the official dimensions (front and side).
Why is LK935 better than 4K550ST?
- Light source life20,000 h vs 3,000 h6.7×
- Brightness (ANSI / ISO lumens)5,500 lm vs 4,500 lm+22%
- Lens shiftVertical and horizontal vs Vertical
- Contrast ratio (dynamic / claimed)3,000,000:1 vs 10,000:1300×
Why is 4K550ST better than LK935?
- Fan noise40 dB vs 32 dB+25%
- HDMI inputs1 vs 22×
- Power consumption440 W vs 335 W+31%
- Weight7 kg vs 5.9 kg+19%
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) | 5,500 lm | 4,500 lm |
| Contrast ratio (dynamic / claimed) | 3,000,000:1 | 10,000:1 |
| HDR support | Yes | Yes |
| 3D playback | Yes | Yes |
| Gaming | ||
| Maximum refresh rate | 120 Hz | 120 Hz |
| Lens & placement | ||
| Throw ratio | 1.36:1 | 0.78:1 |
| Throw ratio (zoomed in) | 2.18:1 | — |
| Throw type | Standard throw (1.0:1 and longer) | Short throw (0.4–1.0:1) |
| Distance for a 100″ 16:9 image | 3.01 m | 1.73 m |
| Smallest image size | 30″ | 29″ |
| Largest image size | 300″ | 300″ |
| Optical zoom | 1.6× | — |
| Lens shift | Vertical and horizontal | Vertical |
| Autofocus | No | — |
| Keystone correction | Yes | — |
| Automatic keystone correction | No | — |
| Sound | ||
| Built-in speakers (total output) | 10 W | 10 W |
| Connectivity | ||
| HDMI inputs | 1 | 2 |
| USB-C video input | Yes | — |
| USB port | Yes | Yes |
| Ethernet (LAN) | Yes | Yes |
| VGA input | No | Yes |
| Audio output | Yes | Yes |
| Battery, power & lifetime | ||
| Power consumption | 440 W | 335 W |
| Light source life | 20,000 h | 3,000 h |
| Light source life (eco mode) | — | 4,000 h |
| Design & noise | ||
| Fan noise | 40 dB | 32 dB |
| Fan noise (eco mode) | 33 dB | — |
| Weight | 7 kg | 5.9 kg |
| Width | 416 mm | 392 mm |
| Height | 166 mm | 129 mm |
| Depth | 351 mm | 281 mm |
| Colours | White | White |
