BenQ TH671ST
#5 in Native 1080pFull review
A bright short throw 1080p projector for gaming in small rooms, for buyers who don’t need 4K or HDR.
Amazon $849$849
The BenQ TH671ST rates 4.1 among native 1080p projectors; the Epson Home Cinema 3800 rates 3.5 among 4K ones. The BenQ TH671ST costs $780.99 less ($849 vs $1,629.99).
Epson Home Cinema 3800
#28 in 4KFull review
A bright 3LCD home theater projector with flexible placement, for movie rooms more than fast gaming.
Amazon $1,629.99$1,629.99
Prices were last checked October 29, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different type classes (native 1080p and 4K), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | BenQ TH671ST | Epson Home Cinema 3800 |
|---|---|---|
| Overall rating | 4.1/5 | 3.5/5 |
| Brightness 25% | 95 3,000 ANSI lumens | 86 3,000 ISO 21118 lumens |
| Value 15% | 84 $0.28 per lumen | 86 $0.54 per lumen |
| Resolution 10% | 100 1920 x 1080 native | 100 4K (pixel shift) |
| Streaming 15% | 0 no built-in apps; needs a streaming stick | 0 no built-in apps; needs a streaming stick |
| Setup 10% | 50 Auto keystone, 1.2x zoom | 40 1.6x zoom, lens shift |
| Light life 10% | 69 15,000 hour lamp | 6 5,000 hour lamp |
| Gaming 10% | 100 8 ms input lag | 50 input lag not published (neutral score used) |
| Warranty 5% | 100 3-year warranty | 50 2-year warranty |
Independent measurements
BenQ TH671ST
No independent test published yet.
Epson Home Cinema 3800
| Tested by | Brightness | Input lag | Contrast | Conditions |
|---|---|---|---|---|
| ProjectorCentral | 2,912 lm | 20.6 ms | - | 2,912 ANSI lumens in Dynamic mode, High power (1,615 Natural Eco, 1,204 Cinema Eco). Lag 20.6 ms at 4K, 28 ms at 1080p. |
Specifications
| BenQ TH671ST | Epson Home Cinema 3800 | |
|---|---|---|
| Picture | ||
| Brightness | 3,000 ANSI | 3,000 ISO 21118 |
| Native resolution | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) |
| Picture resolution | 1080p | 4K (pixel shift from 1920x1080) |
| Display | DLP | 3LCD |
| Light source | lamp | lamp |
| Light source life | 15,000 hours | 5,000 hours |
| HDR | - | HDR10, HLG |
| Color gamut | 92% Rec.709 | - |
| Native contrast | 10,000:1 | - |
| Dynamic contrast | - | 100,000:1 |
| Placement | ||
| Throw | Short throw (0.7:1) | Standard throw (1.3:1) |
| Largest image | 300 in | 300 in |
| Autofocus | No | No |
| Auto keystone | Yes | No |
| Obstacle avoidance | No | No |
| Auto screen fit | No | No |
| Optical zoom | 1.2x | 1.6x |
| Lens shift | - | Horizontal and vertical |
| Streaming and gaming | ||
| Built-in apps | None | None |
| Input lag | 8 ms | - |
| Top refresh rate | 120 Hz | 60 Hz |
| HDMI ports | 2 | 2 |
| Speakers | 5 W | 20 W |
| Build | ||
| Battery | None | None |
| Fan noise | 33 dB | 35 dB |
| Power | 320 W | 406 W |
| Dimensions | 296 x 224 x 120 mm (W x D x H) | 16.1 x 13.0 x 6.5 in (W x D x H) |
| Weight | 6 lb | 15.2 lb |
| Warranty | 3 years | 2 years |
| Released | 2017-11 | 2019-10 |