BenQ LH830ST vs Optoma ZH451ST

BenQ LH830ST is quieter. Optoma ZH451ST is $301.01 cheaper, better for gaming and lighter.

	BenQ LH830ST$1,999.99 · Amazon Buy	Optoma ZH451ST$1,698.98 · Amazon Buy

Key differences
White light output
White light output	4,000 lm ANSI	4,200 lm ISO
Lowest input lag
Lowest input lag	16.7 msDerived	8.4 msDerived
Fan noise
Fan noise	Normal 30 dB(A) · Eco 24 dB(A)	Normal 36 dB(A) · Eco 29 dB(A)
MSRP
MSRP	$1,999	—
Best price
Best price	$1,999.99	$1,698.98
Room fit80″100″120″150″
Distance to screen
Distance to screen	1.1 m	1.1 m
Picture
White light output
White light output	4,000 lm ANSI	4,200 lm ISO
Brightness uniformity
Brightness uniformity	—	75%
Imaging technology
Imaging technology	DLP	DLP
Chip / panel diagonal
Chip / panel diagonal	0.65 in	—
Native resolution
Native resolution	1080p (1920 × 1080)	1080p (1920 × 1080)
Native aspect
Native aspect	16:9Derived	16:9Derived
Dynamic contrast
Dynamic contrast	3,000,000:1	2,000,000:1
Colour gamut
Colour gamut	Rec. 709 93% coverage	—
Colour bit depth (per channel)
Colour bit depth (per channel)	10 bit	10 bit
Gamma / EOTF presets
Gamma / EOTF presets	—	2.2, 2.4
HDR formats
HDR formats	HDR10, HLG	HDR10, HLG
Colour management (CMS)
Colour management (CMS)	—	6-axis
Picture certifications
Picture certifications	—	ISF, Filmmaker Mode
3D
3D	—	Yes
3D formats
3D formats	—	Side-by-side, Top-bottom, Frame sequential
3D glasses sync
3D glasses sync	—	DLP-Link
Light source
Light source
Light source	Laser (phosphor)	Laser (phosphor)
Emitter
Emitter	—	Blue laser + phosphor
Light engine
Light engine	—	DuraCore
Light-source life
Light-source life	20,000 h normal · 30,000 h eco	30,000 h
Light output control
Light output control	—	Steps
Constant brightness mode
Constant brightness mode	—	Yes
Cool-down time
Cool-down time	—	90 s
Optics
Throw ratio
Throw ratio	0.5:1	0.5:1
Image size
Image size	70–300 in	30–300 in
Projection offset
Projection offset	116%	116%
Zoom
Zoom	None	Digital
Focal length
Focal length	17.51 mm	7.51 mm
Aperture (f-number)
Aperture (f-number)	2.8	2.8
Focus
Focus	—	Manual
Autofocus
Autofocus	—	No
Vertical keystone
Vertical keystone	30°	15°
Horizontal keystone
Horizontal keystone	30°	15°
Auto keystone
Auto keystone	Yes	—
Corner correction
Corner correction	4-corner	4-corner
Motion & gaming
Input lag
Input lag	1080p: 60 Hz 16.7 ms	About 1080p: 60 Hz 16.7 ms · 120 Hz 8.4 ms · 4K UHD: 60 Hz 16.7 ms
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0 (HDCP 2.2)	2 × HDMI 2.0
Other video inputs
Other video inputs	—	VGA
Max input resolution
Max input resolution	4K UHD	4K UHD
Control ports
Control ports	RS-232	RS-232, Wired IR, 12 V trigger
PJLink
PJLink	—	Class 1
Control-system drivers
Control-system drivers	—	Crestron
Horizontal scan
Horizontal scan	15–135 kHz	15–135 kHz
Vertical scan
Vertical scan	23–120 Hz	24–120 Hz
Smart platform
Ethernet
Ethernet	Yes	Yes
Audio
Speaker power
Speaker power	15 W	15 W
Speakers
Speakers	1	1
Layout
Layout	—	Mono
Audio outputs
Audio outputs	3.5 mm	—
HDMI audio return
HDMI audio return	NoneDerived	—
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	279 × 229 × 121 mm	274 × 216 × 114 mm
Weight
Weight	3,400 g	3,000 g
Orientations
Orientations	Table, Ceiling, Rear	Portrait, 360°
Ceiling mount
Ceiling mount	M4	M4, 10 mm screws
Ingress protection
Ingress protection	IP6X (light engine)	IP6X
Sealed optical engine
Sealed optical engine	Yes	—
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Operating humidity
Operating humidity	10–80%RH	—
Altitude
Altitude	3,000 m · high-altitude mode	2,500 m · high-altitude mode
Power draw
Power draw	Max 250 W · Normal 230 W · Eco 130 W	Max 170 W
Standby
Standby	Up to 0.5 W	Up to 0.5 W
Networked standby
Networked standby	Up to 2 W	—
Power supply
Power supply	—	External adapter
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
Fan noise
Fan noise	Normal 30 dB(A) · Eco 24 dB(A)	Normal 36 dB(A) · Eco 29 dB(A)
Safety & support
Laser class
Laser class	Class 1	Class 1
Risk group
Risk group	RG2	RG2
Hazard distance
Hazard distance	—	1 m
Marks
Marks	—	FCC
Warranty
Warranty	3 yr	—
User manual
User manual	https://esupportdownload.benq.com/esupport/PROJECTOR%20FOR%20BUSINESS/UserManual/LH830ST/UM_EN_251023092502.pdf	https://region-resource.optoma.com/products/documents/0NL94Q0vvVEJVe7dxQKlMzhtuURlT8FwUXNkLi8y.pdf
In the box
In the box
In the box	Power cord, Power adapter, Remote, Remote batteries, Quick start guide, Warranty card	Power cord, Remote, Remote batteries, Quick start guide
Remote
Remote	—	IR

BenQ LH830ST$1,999.99 · Amazon

Buy

Optoma ZH451ST$1,698.98 · Amazon

Buy