- Attenborough.film
- Compare
- UHD38x vs LS740HD
Optoma UHD38x vs ViewSonic LS740HD
What UHD38x does better (5) and where LS740HD wins (7) — every spec side by side.
Dimensions
Size comparison
UHD38xLS740HD
| UHD38x | LS740HD | Difference | |
|---|---|---|---|
| Height | 118 mm | 129 mm | −11 mm |
| Width | 315 mm | 286 mm | +29 mm |
| Depth | 270 mm | 216 mm | +54 mm |
| Weight | 4 kg | 3 kg | +1 kg |
Drawn to the same scale from the official dimensions (front and side).
Why is UHD38x better than LS740HD?
- Resolution (on screen)3840 × 2160 (4K UHD) vs 1920 × 1080 (Full HD)
- Contrast ratio (dynamic / claimed)1,000,000:1 vs 300,000:13.3×
- HDR supportYes · LS740HD: No
- Audio outputYes · LS740HD: No
- Fan noise28 dB vs 32 dB+14%
Why is LS740HD better than UHD38x?
- Light source life4,000 h vs 20,000 h5×
- Brightness (ANSI / ISO lumens)4,000 lm vs 5,000 lm+25%
- Built-in speakers (total output)10 W vs 15 W+50%
- Ethernet (LAN)No · UHD38x: Yes
- Optical zoom1.1× vs 2×+82%
- Power consumption305 W vs 210 W+45%
- Weight3.98 kg vs 3 kg+33%
Specifications
Side by side
| Picture | ||
| Resolution (on screen) | 3840 × 2160 (4K UHD) | 1920 × 1080 (Full HD) |
| Native panel resolution | 1920 × 1080 (Full HD) | 1920 × 1080 (Full HD) |
| 4K method | 4K by pixel shifting | — |
| Display technology | DLP | DLP |
| Light source | — | Laser |
| Brightness (ANSI / ISO lumens) | 4,000 lm | 5,000 lm |
| Contrast ratio (dynamic / claimed) | 1,000,000:1 | 300,000:1 |
| HDR support | Yes | No |
| HDR formats | HLG | — |
| 3D playback | Yes | Yes |
| Gaming | ||
| Maximum refresh rate | 120 Hz | 120 Hz |
| Lens & placement | ||
| Throw ratio | 1.5:1 | 1.13:1 |
| Throw ratio (zoomed in) | 1.66:1 | 1.47:1 |
| Throw type | Standard throw (1.0:1 and longer) | Standard throw (1.0:1 and longer) |
| Distance for a 100″ 16:9 image | 3.32 m | 2.5 m |
| Smallest image size | 33″ | 30″ |
| Largest image size | 300″ | 300″ |
| Optical zoom | 1.1× | 2× |
| Lens shift | None | None |
| Keystone correction | Yes | Yes |
| Automatic keystone correction | No | No |
| Sound | ||
| Built-in speakers (total output) | 10 W | 15 W |
| Smart & streaming | ||
| Wi-Fi | — | Yes |
| Connectivity | ||
| HDMI inputs | 2 | 2 |
| HDMI version | 2 | 2 |
| USB port | Yes | Yes |
| Ethernet (LAN) | No | Yes |
| VGA input | No | No |
| Audio output | Yes | No |
| Battery, power & lifetime | ||
| Power consumption | 305 W | 210 W |
| Light source life | 4,000 h | 20,000 h |
| Light source life (eco mode) | 10,000 h | 30,000 h |
| Design & noise | ||
| Fan noise | 28 dB | 32 dB |
| Fan noise (eco mode) | 26 dB | 26 dB |
| Weight | 3.98 kg | 3 kg |
| Width | 315 mm | 286 mm |
| Height | 118 mm | 129 mm |
| Depth | 270 mm | 216 mm |
| Colours | White | White |
