ViewSonic LSD400HD-ST vs ViewSonic LX720-4K

What LSD400HD-ST does better (3) and where LX720-4K wins (1) — every spec side by side.

ViewSonic · 2025LSD400HD-ST

6.7Score

3 advantages≈ US$1,450

ViewSonic · 2025LX720-4K

7.8Score

1 advantage≈ US$1,500

Higher score

6.1Picture8.0

5.5Noise, lifetime & portability5.1

Dimensions

Size comparison

LSD400HD-STLX720-4K

Drawn to the same scale from the official dimensions (front and side).

Specifications

Only differences	ViewSonic LSD400HD-ST≈ US$1,4506.7	ViewSonic LX720-4K≈ US$1,5007.8
Picture
Resolution (on screen)	1920 × 1080 (Full HD)	3840 × 2160 (4K UHD)
Native panel resolution	1920 × 1080 (Full HD)	1920 × 1080 (Full HD)
4K method	—	4K by pixel shifting
Display technology	DLP	DLP
Light source	Laser	Laser
Brightness (ANSI / ISO lumens)	4,000 lm	3,500 lm
Contrast ratio (dynamic / claimed)	300,000:1	300,000:1
Lens & placement
Largest image size	300″	300″
Keystone correction	Yes	Yes
Automatic keystone correction	No	No
Sound
Built-in speakers (total output)	—	10 W
Smart & streaming
Wi-Fi	—	Yes
Bluetooth	—	Yes
Internal storage	—	8 GB
Connectivity
HDMI inputs	2	2
USB port	Yes	Yes
Ethernet (LAN)	Yes	No
VGA input	No	No
Audio output	Yes	Yes
Battery, power & lifetime
Light source life	20,000 h	20,000 h
Light source life (eco mode)	30,000 h	30,000 h
Design & noise
Fan noise	32 dB	32 dB
Fan noise (eco mode)	27 dB	26 dB
Weight	3.1 kg	3.5 kg
Width	286 mm	312 mm
Height	129 mm	104 mm
Depth	216 mm	234 mm
Colours	White	—