Panasonic PT-LB426 vs ViewSonic LS831WU

Panasonic PT-LB426 is lighter. ViewSonic LS831WU is brighter and sharper.

	Panasonic PT-LB426	ViewSonic LS831WUMSRP $2,500

Key differences
White light outputANSI
White light outputANSI	4,100 lm ISO (Normal power, Dynamic mode) · 4,100 lm ANSI	4,500 lm ANSI
Native resolution
Native resolution	1024 × 768	WUXGA (1920 × 1200)
Throw ratio
Throw ratio	1.48–1.78:1	0.25:1
Light source
Light source	Lamp	Laser (phosphor)
Fan noise
Fan noise	Normal 38 dB(A) · Eco 35 dB(A)	—
MSRP
MSRP	—	$2,500
Room fit80″100″120″150″
Distance to screen
Distance to screen	3.0–3.6 m	0.54 m
Picture
White light outputANSI
White light outputANSI	4,100 lm ISO (Normal power, Dynamic mode) · 4,100 lm ANSI	4,500 lm ANSI
Brightness uniformity
Brightness uniformity	85%	—
Imaging technology
Imaging technology	3LCD	DLP
Chip / panel diagonal
Chip / panel diagonal	0.63 in	—
Native resolution
Native resolution	1024 × 768	WUXGA (1920 × 1200)
Native aspect
Native aspect	4:3Derived	16:10Derived
Dynamic contrast
Dynamic contrast	20,000:1	3,000,000:1
Colour bit depth (per channel)
Colour bit depth (per channel)	8 bit	—
Picture mode memories
Picture mode memories	—	2
3D
3D	—	Yes
3D formats
3D formats	—	Frame packing, Side-by-side, Top-bottom, Frame sequential
Light source
Light source
Light source	Lamp	Laser (phosphor)
Emitter
Emitter	—	Blue laser + phosphor
Lamp power
Lamp power	230 W	—
Replacement lamp
Replacement lamp	ET-LAL510	—
Light-source life
Light-source life	10,000 h normal · 20,000 h eco	20,000 h
Life defined as
Life defined as	50% brightness	—
Optics
Throw ratio
Throw ratio	1.48–1.78:1	0.25:1
Image size
Image size	30–300 in	70–200 in
Zoom
Zoom	Optical	None
Zoom ratio
Zoom ratio	1.2×Derived	—
Focal length
Focal length	19.16–23.02 mm	—
Aperture (f-number)
Aperture (f-number)	1.6–1.76	—
Focus
Focus	Manual	Manual
Vertical lens shift
Vertical lens shift	—	None
Horizontal lens shift
Horizontal lens shift	—	None
Vertical keystone
Vertical keystone	35°	5°
Horizontal keystone
Horizontal keystone	35°	5°
Auto keystone
Auto keystone	Yes	—
Corner correction
Corner correction	4-corner	4-corner
Grid warp
Grid warp	Yes	—
Interchangeable lens
Interchangeable lens	No	No
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI (HDCP 1.4)	2 × HDMI 2.0 (HDCP 2.2)
Other video inputs
Other video inputs	VGA, Composite	VGA, Composite, HDBaseT
Max input resolution
Max input resolution	—	4K UHD
Audio inputs
Audio inputs	3.5 mm, RCA	3.5 mm, RCA
USB media playback
USB media playback	Yes	—
Control ports
Control ports	RS-232	RS-232, 12 V trigger
PJLink
PJLink	Class 2	—
Control-system drivers
Control-system drivers	—	Crestron, AMX
Horizontal scan
Horizontal scan	—	15–102 kHz
Vertical scan
Vertical scan	—	23–120 Hz
Smart platform
Ethernet
Ethernet	Yes	Yes
Audio
Speaker power
Speaker power	10 W	20 W
Speakers
Speakers	—	2
Layout
Layout	Mono	Stereo
Audio outputs
Audio outputs	3.5 mm	3.5 mm
HDMI audio return
HDMI audio return	NoneDerived	NoneDerived
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	335 × 252 × 96 mm	492 × 387 × 157 mm
Weight
Weight	2,900 g	9,900 g
Orientations
Orientations	Table, Ceiling, Rear	Table, Ceiling, Rear
Ceiling mount
Ceiling mount	M4, 10 mm deep, 1.25 N·m	M4, 12.8–15.8 mm screws
Dust filter
Dust filter	Replaceable	—
Environment & power
Operating temperature
Operating temperature	5–40°C	0–40°C
Operating humidity
Operating humidity	20–80%RH	10–90%RH
Altitude
Altitude	2,700 m	3,000 m · high-altitude mode
Power draw
Power draw	Max 300 W	504 W
Standby
Standby	0.5 W	Up to 0.5 W
Power supply
Power supply	Built in	—
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
Fan noise
Fan noise	Normal 38 dB(A) · Eco 35 dB(A)	—
Safety & support
Laser class
Laser class	—	Class 1
Marks
Marks	FCC	FCC
Warranty
Warranty	—	3 yr
User manual
User manual	https://bizpartner.panasonic.net/public/ppr/file_view/194378	https://www.viewsonicglobal.com/public/products_download/user_guide/Projector/LS831WU/LS831WU_UG_ENG.pdf
Spare parts
Spare parts	Lamp ET-LAL510 · Air filter ET-RFL300	—
In the box
In the box
In the box	Power cord, Remote, Remote batteries	Power cord, Remote, Quick start guide, VGA cable
Remote
Remote	—	IR