Optoma ZK608T vs Sharp XP-P621U-W

Optoma ZK608T is lighter.

	Optoma ZK608T	Sharp XP-P621U-W

Key differences
White light outputISO
White light outputISO	6,000 lm ISO	6,200 lm ISO · 6,200 lm ANSI
Native resolution
Native resolution	—	WUXGA (1920 × 1200)
Throw ratio
Throw ratio	1.2–1.92:1	1.08–1.76:1
Lowest input lag
Lowest input lag	4.36 msDerived	—
HDR formats
HDR formats	HDR10, HLG	—
Fan noise
Fan noise	Max 36 dB(A) · Eco 33 dB(A)	Normal 29 dB(A) · Eco 22 dB(A)
Room fit80″100″120″150″
Distance to screen
Distance to screen	2.7–4.3 m	2.3–3.8 m
Picture
White light outputISO
White light outputISO	6,000 lm ISO	6,200 lm ISO · 6,200 lm ANSI
Brightness uniformity
Brightness uniformity	85%	—
Imaging technology
Imaging technology	DLP	3LCD
Chip / panel diagonal
Chip / panel diagonal	—	0.64 in
Native resolution
Native resolution	—	WUXGA (1920 × 1200)
Native aspect
Native aspect	16:9Derived	16:10Derived
Addressable resolution
Addressable resolution	4K UHD (3840 × 2160)	—
Dynamic contrast
Dynamic contrast	300,000:1	3,000,000:1
Colour bit depth (per channel)
Colour bit depth (per channel)	—	10 bit
HDR formats
HDR formats	HDR10, HLG	—
3D
3D	Yes	—
Light source
Light source
Light source	Laser (phosphor)	Laser (phosphor)
Emitter
Emitter	Blue laser + phosphor	Blue laser + phosphor
Light-source life
Light-source life	30,000 h eco	20,000 h
Life defined as
Life defined as	—	50% brightness
Light output control
Light output control	—	Continuous
Constant brightness mode
Constant brightness mode	—	Yes
Optics
Throw ratio
Throw ratio	1.2–1.92:1	1.08–1.76:1
Image size
Image size	30–300 in	30–300 in
Projection offset
Projection offset	106%	—
Zoom
Zoom	Optical	Optical
Zoom ratio
Zoom ratio	1.6×Derived	1.63×Derived
Focal length
Focal length	17.63–27.9 mm	15.3–24.6 mm
Aperture (f-number)
Aperture (f-number)	—	1.58–2.02
Focus
Focus	—	Manual
Vertical lens shift
Vertical lens shift	-106–126%	0–44%
Horizontal lens shift
Horizontal lens shift	±10%	±20%
Motorised lens shift
Motorised lens shift	No	No
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
Motion & gaming
Input lag
Input lag	1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 240 Hz 4.4 ms · 4K UHD: 60 Hz 16.9 ms	—
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0 (HDCP 2.3)	2 × HDMI (HDCP 1.4)
Other video inputs
Other video inputs	VGA, HDBaseT	HDBaseT
Max input resolution
Max input resolution	—	4K UHD
Audio inputs
Audio inputs	3.5 mm	—
Control ports
Control ports	RS-232, 12 V trigger	RS-232
Control-system drivers
Control-system drivers	Crestron, AMX	Crestron, AMX
Horizontal scan
Horizontal scan	—	15–100 kHz
Vertical scan
Vertical scan	24–120 Hz	50–120 Hz
Smart platform
Wi-Fi
Wi-Fi	—	None
Ethernet
Ethernet	Yes	Yes
Audio
Speaker power
Speaker power	15 W	16 W
Speakers
Speakers	2	1
Layout
Layout	—	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)	374 × 302 × 117 mm	480 × 407 × 143 mm
Weight
Weight	6,300 g	9,600 g
Colours
Colours	—	White
Orientations
Orientations	Table, Ceiling, Rear, Portrait, 360°	Table, Ceiling, Rear, Portrait, 360°
Ceiling mount
Ceiling mount	—	4 × M4
Dust filter
Dust filter	None	None
Ingress protection
Ingress protection	IP6X (light engine)	IP5X (light engine)
Sealed optical engine
Sealed optical engine	Yes	Yes
Environment & power
Operating temperature
Operating temperature	—	0–45°C
Operating humidity
Operating humidity	—	20–80%RH
Altitude
Altitude	—	2,600 m · high-altitude mode
Power draw
Power draw	Max 366 W · Normal 300 W	Normal 315 W · Eco 260 W
Standby
Standby	—	0.31 W
Networked standby
Networked standby	—	0.8 W
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
Fan noise
Fan noise	Max 36 dB(A) · Eco 33 dB(A)	Normal 29 dB(A) · Eco 22 dB(A)
Safety & support
Laser class
Laser class	Class 1	Class 1
Risk group
Risk group	RG2	RG2
FDA laser notice
FDA laser notice	Notice 57	—
Marks
Marks	—	CE, UKCA, FCC, UL
Warranty
Warranty	—	🇨🇦 CA 5 yr or 20,000 h · 🇪🇺 EU 3 yr (light source 3 yr or 10,000 h)
User manual
User manual	https://region-resource.optoma.com/products/import/Documents/b0d04fc7-f84c-44a5-b36c-e8109cc85fa3.pdf	https://www.projectorcentral.com/pdf/projector_manual_12885.pdf
In the box
In the box
In the box	Power cord, Remote, Remote batteries, Quick start guide	Power cord, Remote, Remote batteries, Quick start guide, Lens cap
Remote
Remote	—	IR