The catch
BenQ X500i
With a lower rated output, it has less light-output headroom for a very large screen.
Side by side
The TK710STi is for you if a large picture or some room lighting calls for the higher published light output. The X500i is for you if its lower-cost LED package suits a dark-room budget. Both use the same 0.69 to 0.83 throw range and list the same gaming latency, which means the laser upgrade fixes neither a placement problem nor a refresh problem.
Before you buy
Eight feet from a 120-inch screen is too far back for either optical range, since the longest 120-inch distance for them is about 7.2 feet. If that describes your constraint, look at a longer lens before paying for more light.
Where this comes from
BenQ X500i: 0.69 to 0.83 throw. 104.59 × 0.83 / 12 = 7.23 feet. BenQ TK710STi: The same 0.69 to 0.83 optical throw range.
The catch
With a lower rated output, it has less light-output headroom for a very large screen.
The catch
Extra rated brightness does not come with more optical placement range or a documented gaming format.


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Short gaming room? The BenQ X500i and TK710STi share a throw range, so look at the brightness claim, lamp-free upkeep and high-refresh limits.
Which one fits
At roughly this distance, either can frame a 120-inch picture optically.
Higher published output backs the case for the TK710STi, although light falling on the screen still lowers contrast.
From that distance, neither can fill a full-width 120-inch image optically.
That is not a reason to upgrade that the published input-lag figures back up.
In practice
Eight feet from a 120-inch screen is too far back for either optical range, since the longest 120-inch distance for them is about 7.2 feet. If that describes your constraint, look at a longer lens before paying for more light.
BenQ X500i: 0.69 to 0.83 throw. 104.59 × 0.83 / 12 = 7.23 feet. BenQ TK710STi: The same 0.69 to 0.83 optical throw range.
Area is 56 percent greater for a 150-inch 16:9 picture than for a 120-inch one, while the TK710STi's manufacturer brightness rating is 45 percent higher. Even those headline figures do not imply that a 150-inch TK710STi image matches a 120-inch X500i image in brightness per square foot.
BenQ X500i: 2,200 ANSI-lumen claim. Area ratio = (150 / 120)² = 1.5625. BenQ TK710STi: 3,200 ANSI-lumen claim. Output ratio = 3200 / 2200 = 1.455. Ratings are not calibrated-mode measurements.
When a gaming laptop gets carried into a room that doubles as the children’s play space, X500i can take video from a compatible USB-C DisplayPort port, whereas TK710STi needs an HDMI path or a suitable adapter. X500i’s 5W output is too small to count on for powering a gaming laptop, so plan for that separate lead as well.
BenQ X500i: USB-C DisplayPort input, PD out 5V/1A, equal format-specific lag to TK710STi. BenQ TK710STi: HDMI video inputs and no USB-C DisplayPort input in the manufacturer interface table.
Plug in your numbers
This checks hard limits only. Personal preferences are left out of the math.
For a 120-inch 16:9 picture, the manual-table lens range is about 6.01 to 7.23 ft. You entered 9.50 ft. Optical fit only: use the 1.2x optical zoom, level square placement at the fixed image height, body/cable space, 50 cm wall clearance and free airflow. No optical lens shift. For image quality, BenQ recommends the manual’s non-gray table rows. Test the actual image before mounting. Digital correction adds no optical range.
For a 120-inch 16:9 picture, the calculated lens range is about 6.01 to 7.23 ft. You entered 9.50 ft.
Measure distance from the lens to the screen. The math assumes a 16:9 picture and uses the verified throw range for each exact model.

BenQ, X500i
This short-throw 4LED gaming projector puts a big image in front of a desk or sofa without taking up the full depth of the room.

BenQ, TK710STi
This short-throw variant of the TK710 offers the same laser brightness and low-latency modes from a spot much nearer the screen.
Spec by spec
| Spec | BenQ X500i | BenQ TK710STi | In practice |
|---|---|---|---|
| 120-inch placement | About 6.0 to 7.2 ft | About 6.0 to 7.2 ft | Neither leaves any extra room to work with at this screen size. |
| Light engine | 4LED, 2,200 ANSI-lumen claim | Laser, 3,200 ANSI-lumen claim | The main hardware reason to step up is higher rated output, with picture-mode caveats. |
| Portable computer connection | USB-C DisplayPort input with 5W power out | HDMI video inputs, no USB-C DisplayPort input listed | A compatible laptop can plug straight into X500i, though it still needs an adequate power supply of its own. |
| Built-in speakers | Two 5W speakers | One 5W speaker | It alters the built-in arrangement but proves nothing about sound quality or room loudness. |
| 4K gaming | 16.7 ms at 4K/60 | 16.7 ms at 4K/60 | The laser source brings no documented response advantage. |
| 1080p gaming | 4.2 ms at 240 Hz, published | 4.2 ms at 240 Hz, published | A compatible high-refresh source and the right mode are required on both. |
| Streaming | Included Android TV device | Included Android TV device | For supported apps, neither purchase calls for a separate device. |
Trade-offs
Change of plan
Go with BenQ X500i. Your screen already works with the shared short-throw range
Go with BenQ TK710STi. Brightness is worth more to you with a larger screen or occasional lighting
By the numbers
What we found across the home projectors we compare, plus the checked facts behind each finding.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| BenQ X500i |
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| BenQ TK710STi |
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Ready to buy
Open either model on Amazon for the current price, customer reviews and delivery options.

You watch in the dark and want to keep the projector cost down
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At the same short distance, you need more rated light output
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