Optoma ZK420UST vs Philips ProPix 850

Philips ProPix 850 is lighter.

	Optoma ZK420UST	Philips ProPix 850MSRP $699

Key differences
White light outputANSI
White light outputANSI	4,200 lm ANSI	4,000 lm ANSI
Native resolution
Native resolution	—	1080p (1920 × 1080)
Native contrast (on/off)
Native contrast (on/off)	—	1,600:1
Throw ratio
Throw ratio	0.25:1	1.49–1.64:1
Lowest input lag
Lowest input lag	4.3 msDerived	—
HDR formats
HDR formats	HDR10, HLG	—
Light source
Light source	Laser (phosphor)	Lamp
Fan noise
Fan noise	Max 34 dB(A) · Eco 29 dB(A)	—
MSRP
MSRP	—	$699
Room fit80″100″120″150″
Distance to screen
Distance to screen	0.55 m	3.3–3.6 m
Picture
White light outputANSI
White light outputANSI	4,200 lm ANSI	4,000 lm ANSI
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	—
Addressable resolution
Addressable resolution	4K UHD (3840 × 2160)	—
Native contrast (on/off)
Native contrast (on/off)	—	1,600:1
Dynamic contrast
Dynamic contrast	500,000:1	—
Gamma / EOTF presets
Gamma / EOTF presets	2.2, 2.4	—
HDR formats
HDR formats	HDR10, HLG	—
3D
3D	Yes	Yes
3D formats
3D formats	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)	Lamp
Lamp power
Lamp power	—	200 W
Replacement lamp
Replacement lamp	—	PPA3001
Light-source life
Light-source life	30,000 h eco	6,000 h normal · 10,000 h eco
Light output control
Light output control	Steps	—
Optics
Throw ratio
Throw ratio	0.25:1	1.49–1.64:1
Image size
Image size	100–150 in	70–150 in
Projection offset
Projection offset	120%	—
Zoom
Zoom	None	Digital
Focal length
Focal length	3.7 mm	—
Aperture (f-number)
Aperture (f-number)	2.44	—
Focus
Focus	Manual	Manual
Autofocus
Autofocus	—	No
Vertical keystone
Vertical keystone	—	40°
Corner correction
Corner correction	4-corner	—
Grid warp
Grid warp	Yes	—
Interchangeable lens
Interchangeable lens	No	—
Motion & gaming
Input lag
Input lag	1080p: 60 Hz 17 ms · 120 Hz 8.6 ms · 240 Hz 4.3 ms · 4K UHD: 60 Hz 16.9 ms	—
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0	2 × HDMI
Other video inputs
Other video inputs	HDBaseT	—
Max input resolution
Max input resolution	4K UHD	—
Control ports
Control ports	RS-232	RS-232
Horizontal scan
Horizontal scan	15–150 kHz	—
Vertical scan
Vertical scan	24–240 Hz	—
Smart platform
Ethernet
Ethernet	Yes	—
Smart platform
Smart platform	—	None
Audio
Speaker power
Speaker power	15 W	2 W
Speakers
Speakers	1	—
Layout
Layout	Mono	—
Audio outputs
Audio outputs	3.5 mm, HDMI eARC	3.5 mm
HDMI audio return
HDMI audio return	eARCDerived	NoneDerived
Physical & installation
Dimensions (W × D × H)
Dimensions (W × D × H)	327 × 328 × 110 mm	302 × 218 × 99 mm
Weight
Weight	4,200 g	2,500 g
Orientations
Orientations	Portrait, 360°	—
Ceiling mount
Ceiling mount	M4, 10 mm screws	—
Tripod socket
Tripod socket	—	Yes
Ingress protection
Ingress protection	IP6X	—
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Operating humidity
Operating humidity	10–85%RH	—
Altitude
Altitude	3,048 m · high-altitude mode	High-altitude mode
Power draw
Power draw	Max 255 W · Eco 180 W	260 W
Standby
Standby	0.5 W	0.5 W
Power supply
Power supply	External adapter	—
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V
DC input
DC input	24 V	—
Fan noise
Fan noise	Max 34 dB(A) · Eco 29 dB(A)	—
Safety & support
Laser class
Laser class	Class 1	—
Risk group
Risk group	RG2	—
FDA laser notice
FDA laser notice	Notice 57	—
Marks
Marks	FCC	—
Warranty
Warranty	3 yr (light source 5 yr or 12,000 h)	—
User manual
User manual	—	https://www.documents.philips.com/assets/20250907/9a1da8258e69466da511b35101160835.pdf
In the box
In the box
In the box	Power cord, Power adapter, Remote, Remote batteries, Quick start guide	Power cord, Remote, Remote batteries, Quick start guide, Warranty card
Remote
Remote	IR	IR