BenQ TH685P vs Optoma LH352BST

BenQ TH685P is lighter. Optoma LH352BST is quieter.

	BenQ TH685PMSRP $749	Optoma LH352BST

Key differences
White light output
White light output	3,500 lm ANSI	3,300 lm ISO
Throw ratio
Throw ratio	1.13–1.46:1	0.69–0.83:1
Lowest input lag
Lowest input lag	8.3 msDerived	8.4 msDerived
HDR formats
HDR formats	HDR10, HLG	—
Light source
Light source	Lamp	LED
Fan noise
Fan noise	Normal 35 dB(A) · Eco 29 dB(A)	Normal 31 dB(A) · Eco 29 dB(A)
MSRP
MSRP	$749	—
Room fit80″100″120″150″
Distance to screen
Distance to screen	2.5–3.2 m	1.5–1.8 m
Picture
White light output
White light output	3,500 lm ANSI	3,300 lm ISO
Brightness uniformity
Brightness uniformity	—	85%
Imaging technology
Imaging technology	DLP	DLP
Chip / panel diagonal
Chip / panel diagonal	0.48 in	—
Native resolution
Native resolution	1080p (1920 × 1080)	1080p (1920 × 1080)
Native aspect
Native aspect	16:9Derived	16:9Derived
Colour wheel segments
Colour wheel segments	6	—
Colour wheel speed
Colour wheel speed	2×	—
Dynamic contrast
Dynamic contrast	10,000:1	2,000,000:1
Colour gamut
Colour gamut	Rec. 709 95% 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	—
Colour temperature presets
Colour temperature presets	Native, Custom	—
HDR formats
HDR formats	HDR10, HLG	—
Colour management (CMS)
Colour management (CMS)	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	—
Light source
Light source
Light source	Lamp	LED
Lamp power
Lamp power	245 W	—
Replacement lamp
Replacement lamp	5J.JKX05.001	—
Light-source life
Light-source life	4,000 h normal · 10,000 h eco · 15,000 h super eco · 8,000 h dynamic	30,000 h eco
Warm-up time
Warm-up time	30 s	—
Cool-down time
Cool-down time	90 s	—
Optics
Throw ratio
Throw ratio	1.13–1.46:1	0.69–0.83:1
Image size
Image size	30–300 in	30–300 in
Projection offset
Projection offset	105%	103%
Zoom
Zoom	Optical	Optical
Zoom ratio
Zoom ratio	1.3×Derived	1.2×Derived
Focal length
Focal length	11.9–15.5 mm	10.2–12.24 mm
Aperture (f-number)
Aperture (f-number)	1.94–2.07	2.6–2.78
Focus
Focus	Manual	—
Vertical lens shift
Vertical lens shift	±5%	—
Motorised lens shift
Motorised lens shift	No	—
Vertical keystone
Vertical keystone	40°	30°
Horizontal keystone
Horizontal keystone	—	30°
Auto keystone
Auto keystone	Yes	—
Motion & gaming
Max input refresh
Max input refresh	1080p: 120 Hz	1080p: 120 Hz · 4K UHD: 60 Hz
Input lag
Input lag	1080p: 60 Hz 16.7 ms · 120 Hz 8.3 ms · 4K UHD: 60 Hz 33.4 ms	1080p: 60 Hz 16.7 ms · 120 Hz 8.4 ms · 4K UHD: 60 Hz 33.7 ms
Inputs & control
HDMI inputs
HDMI inputs	2 × HDMI 2.0 (HDCP 2.2)	2 × HDMI 2.0
Other video inputs
Other video inputs	None	—
Max input resolution
Max input resolution	4K UHD	—
Audio inputs
Audio inputs	3.5 mm	—
Control ports
Control ports	RS-232	RS-232
Horizontal scan
Horizontal scan	15–102 kHz	15–135 kHz
Vertical scan
Vertical scan	23–120 Hz	24–120 Hz
Smart platform
Smart platform
Smart platform	None	—
Audio
Speaker power
Speaker power	5 W	10 W
Speakers
Speakers	1	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)	312 × 225 × 110 mm	307 × 228 × 126 mm
Weight
Weight	2,790 g	3,175 g
Orientations
Orientations	Table, Ceiling, Rear	Table, Ceiling, Rear, 360°
Ceiling mount
Ceiling mount	M4, 20–25 mm screws	—
Environment & power
Operating temperature
Operating temperature	0–40°C	0–40°C
Operating humidity
Operating humidity	10–90%RH	—
Altitude
Altitude	3,000 m · high-altitude mode	3,048 m
Power draw
Power draw	Max 340 W · Normal 297 W · Eco 206 W	Max 226 W · Eco 124 W
Standby
Standby	Up to 0.5 W	Up to 0.5 W
Mains input
Mains input	100–240 V · 50/60 Hz	100–240 V · 50/60 Hz
Fan noise
Fan noise	Normal 35 dB(A) · Eco 29 dB(A)	Normal 31 dB(A) · Eco 29 dB(A)
Safety & support
Risk group
Risk group	RG2	—
Warranty
Warranty	3 yr (light source 1 yr or 2,000 h)	1 yr (light source 5 yr or 12,000 h)
User manual
User manual	https://esupportdownload.benq.com/esupport/PROJECTOR/UserManual/TH685P/TH685P_UM_EN_230605154000.pdf	https://region-resource.optoma.com/products/documents/zxu5ywIf5l6KP4tqTxtOSlYPnDy1LAh9a2E2o2E4.pdf
Spare parts
Spare parts	Lamp 5J.JKX05.001	—
In the box
In the box
In the box	Power cord, Remote, Remote batteries, Quick start guide, Warranty card	Power cord, Remote, Remote batteries, Quick start guide
Remote
Remote	IR	—