BenQ LK830ST vs Optoma ZK551

BenQ LK830ST is quieter. Optoma ZK551 is $700 cheaper.

	BenQ LK830ST$2,599 · Amazon Buy	Optoma ZK551$1,899 · Amazon Buy

Key differences
White light output
White light output	4,000 lm ANSI	5,100 lm ISO
Native resolution
Native resolution	1080p (1920 × 1080)	—
Throw ratio
Throw ratio	0.5:1	1.4–2.24:1
Lowest input lag
Lowest input lag	4.2 msDerived	4.4 msDerived
HDR formats
HDR formats	HDR10, HLG	—
Fan noise
Fan noise	Normal 30 dB(A) · Eco 24 dB(A)	Normal 34 dB(A) · Eco 28 dB(A)
MSRP
MSRP	$2,499	—
Best price
Best price	$2,599	$1,899
Room fit80″100″120″150″
Distance to screen
Distance to screen	1.1 m	3.1–5.0 m
Picture
White light output
White light output	4,000 lm ANSI	5,100 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)	—
Native aspect
Native aspect	16:9Derived	16:9Derived
Pixel shift
Pixel shift	XPR 4-way	XPR 4-way
Addressable resolution
Addressable resolution	4K UHD (3840 × 2160)	4K UHD (3840 × 2160)
Dynamic contrast
Dynamic contrast	3,000,000:1	3,000,000:1
Colour gamut
Colour gamut	Rec. 709 93% coverage	—
Colour bit depth (per channel)
Colour bit depth (per channel)	10 bit	—
Gamma / EOTF presets
Gamma / EOTF presets	2.2, 2.4, 2.6	2.2, 2.4
HDR formats
HDR formats	HDR10, HLG	—
Tone mapping
Tone mapping	Adjustable	—
Colour management (CMS)
Colour management (CMS)	6-axis	6-axis
Picture mode memories
Picture mode memories	2	—
3D
3D	Yes	Yes
3D formats
3D formats	Frame packing, Side-by-side, Top-bottom, Frame sequential	Frame packing, 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 eco
Light output control
Light output control	Continuous	—
Constant brightness mode
Constant brightness mode	—	Yes
Cool-down time
Cool-down time	—	90 s
Optics
Throw ratio
Throw ratio	0.5:1	1.4–2.24:1
Image size
Image size	70–300 in	20–300 in
Projection offset
Projection offset	114%	102%
Zoom
Zoom	Digital	Optical
Zoom ratio
Zoom ratio	—	1.6×Derived
Focal length
Focal length	17.51 mm	20.91–32.62 mm
Aperture (f-number)
Aperture (f-number)	2.8	2.5–3.26
Focus
Focus	Manual	Manual
Autofocus
Autofocus	—	No
Vertical lens shift
Vertical lens shift	None	0–15.1%
Horizontal lens shift
Horizontal lens shift	None	—
Vertical keystone
Vertical keystone	30°	30°
Horizontal keystone
Horizontal keystone	30°	30°
Auto keystone
Auto keystone	Yes	—
Corner correction
Corner correction	4-corner	—
Grid warp
Grid warp	Yes	Yes
Interchangeable lens
Interchangeable lens	No	No
Motion & gaming
Max input refresh
Max input refresh	1080p: 120 Hz · 240 Hz · 4K UHD: 60 Hz	1080p: 240 Hz · 4K UHD: 60 Hz
Input lag
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.3 ms · 240 Hz 4.2 ms · 4K UHD: 60 Hz 16.7 ms	1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 240 Hz 4.4 ms · 4K UHD: 60 Hz 17 ms
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0 (HDCP 2.2)	2 × HDMI 2.0 (HDCP 2.3)
Max input resolution
Max input resolution	4K UHD	4K UHD
Control ports
Control ports	RS-232	RS-232, 12 V trigger
PJLink
PJLink	—	Class 1
Control-system drivers
Control-system drivers	AMX	Crestron
Horizontal scan
Horizontal scan	15–135 kHz	15–150 kHz
Vertical scan
Vertical scan	23–240 Hz	24–240 Hz
Smart platform
Wi-Fi
Wi-Fi	None	—
Ethernet
Ethernet	Yes	Yes
Casting
Casting	—	Miracast
Audio
Speaker power
Speaker power	15 W	15 W
Speakers
Speakers	1	1
Layout
Layout	Mono	Mono
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)	279 × 229 × 121 mm	274 × 216 × 114 mm
Weight
Weight	3,600 g	3,500 g
Colours
Colours	Black	—
Orientations
Orientations	Ceiling, Rear	Table, Ceiling, Rear, Portrait, 360°
Ceiling mount
Ceiling mount	M4	M4, 10 mm screws
Ingress protection
Ingress protection	IP6X (light engine)	IP6XPreliminary
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	3,048 m · high-altitude mode
Power draw
Power draw	Max 250 W · Normal 230 W · Eco 130 W	Max 245 W · Normal 245 W · Eco 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	External adapterPreliminary
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
DC input
DC input	24 V	—
Fan noise
Fan noise	Normal 30 dB(A) · Eco 24 dB(A)	Normal 34 dB(A) · Eco 28 dB(A)
Safety & support
Laser class
Laser class	Class 1	Class 1
Risk group
Risk group	RG2	RG2
Marks
Marks	—	FCC
Warranty
Warranty	3 yr	—
User manual
User manual	https://www.audiogeneral.com/BenQ/LK830ST/LK830ST_LH830ST_LW830ST_User_Manual.pdf	https://region-resource.optoma.com/products/documents/K5mU9Peeq4zSbamp55pR5XFag9nk3bx7MMN5DCWz.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	Backlit	IR

BenQ LK830ST$2,599 · Amazon

Buy

Optoma ZK551$1,899 · Amazon

Buy