Optoma ZK431ST vs Philips ProPix 650

Philips ProPix 650 is lighter and in stock.

	Optoma ZK431ST	Philips ProPix 650$249 · Amazon Buy

Key differences
White light output
White light output	—	4,000 lm ANSI
Native resolution
Native resolution	—	WXGA (1280 × 800)
Native contrast (on/off)
Native contrast (on/off)	—	2,000:1
Throw ratio
Throw ratio	0.5:1	1.55–1.7:1
Lowest input lag
Lowest input lag	8.6 msDerived	—
Light source
Light source	Laser (phosphor)	Lamp
Fan noise
Fan noise	Normal 35 dB(A) · Eco 29 dB(A)	Eco 29 dB(A)
MSRP
MSRP	—	$499
Best price
Best price	—	$249
Room fit80″100″120″150″
Distance to screen
Distance to screen	1.1 m	3.3–3.7 m
Picture
White light output
White light output	—	4,000 lm ANSI
Claimed brightness (non-standard)
Claimed brightness (non-standard)	4,100 lm	—
Brightness uniformity
Brightness uniformity	75%	—
Imaging technology
Imaging technology	DLP	DLP
Chip / panel diagonal
Chip / panel diagonal	—	0.65 in
Native resolution
Native resolution	—	WXGA (1280 × 800)
Native aspect
Native aspect	16:9Derived	16:10Derived
Addressable resolution
Addressable resolution	4K UHD (3840 × 2160)	—
Native contrast (on/off)
Native contrast (on/off)	—	2,000:1
Dynamic contrast
Dynamic contrast	2,000,000:1	—
Gamma / EOTF presets
Gamma / EOTF presets	2.2, 2.4	—
3D
3D	Yes	Yes
3D formats
3D formats	Frame packing, Side-by-side, Top-bottom	—
3D glasses sync
3D glasses sync	DLP-Link	—
Light source
Light source
Light source	Laser (phosphor)	Lamp
Lamp power
Lamp power	—	200 W
Light-source life
Light-source life	30,000 h eco	6,000 h normal · 10,000 h eco
Optics
Throw ratio
Throw ratio	0.5:1	1.55–1.7:1
Image size
Image size	30–300 in	60–150 in
Projection offset
Projection offset	114%	—
Zoom
Zoom	None	—
Focal length
Focal length	7.51 mm	—
Aperture (f-number)
Aperture (f-number)	2.8	—
Focus
Focus	Manual	Manual
Autofocus
Autofocus	—	No
Vertical keystone
Vertical keystone	15°	40°
Horizontal keystone
Horizontal keystone	15°	—
Corner correction
Corner correction	4-corner	—
Grid warp
Grid warp	Yes	—
Lens material
Lens material	—	Glass
Motion & gaming
Input lag
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.6 ms · 4K UHD: 60 Hz 16.7 ms	—
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0	HDMI
Other video inputs
Other video inputs	—	VGA
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
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	—
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)	274 × 216 × 109 mm	302 × 218 × 99 mm
Weight
Weight	2,900 g	2,500 g
Orientations
Orientations	360°	Table, Ceiling
Ceiling mount
Ceiling mount	M4, screws ≥ 10 mm	—
Tripod socket
Tripod socket	—	Yes
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Altitude
Altitude	3,048 m	High-altitude mode
Power draw
Power draw	Max 178 W · Eco 125 W	260 W
Standby
Standby	Up to 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	19.5 V	—
Fan noise
Fan noise	Normal 35 dB(A) · Eco 29 dB(A)	Eco 29 dB(A)
Safety & support
Laser class
Laser class	Class 1	—
Risk group
Risk group	RG2	—
Hazard distance
Hazard distance	1 m	—
FDA laser notice
FDA laser notice	Notice 57	—
Marks
Marks	FCC	CE
Warranty
Warranty	5 yr	—
User manual
User manual	—	https://www.documents.philips.com/assets/20250907/3af740f385cd4c5c9a99b35101160708.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, Warranty card
Remote
Remote	—	IR

Optoma ZK431ST

Philips ProPix 650$249 · Amazon

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