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About the scoresThe scores are calculated mechanically by applying the criteria table at the end of the page to figures published on the manufacturers' official pages and manuals (and on retail or comparison pages where an official figure was not available). We call it the "Spec Score".
Spec Score #1Monitor-mounted
Best if you want to keep your desk surface clear
3.80★★★★☆Spec Score (out of 5)
See on Amazon¥23,400See on Rakuten¥23,400Price as of 2026-09-02 · affiliate link · Opens the shop's site
Score Breakdown
Specs
| Mounting | Monitor-mounted (clamp) |
|---|---|
| Color temperature | 2700 to 6500K (8 steps) |
| Brightness control | 16 levels |
| Brightness | Center illuminance over 1000 lux (500 lux over 85 × 50 cm) |
| Color rendering | Rf > 96 (as listed by the maker) |
| Automatic functions | Auto-dimming / auto on-off by ultrasonic sensor (turns off after 5 minutes with no one detected) |
| Compatible monitors | 0.43 to 6.5 cm thick; curved 1000R to 1800R |
| Power | USB Type-C (5V, up to 1.7A, up to 8.5W); adapter included |
| USB cable length | 180 cm |
| Body size | 50 × 13.5 × 9.2 cm |
🙂 Good points
- Hangs on the monitor, so it uses no desk space
- 8 color-temperature steps (2700 to 6500K) and 16 brightness levels
- Auto-dimming, and auto on/off by sensing whether you are there
🙁 Things to note
- At the listed date (2026-09-02) the price is 23,400 yen, the highest of the four
- Check your monitor thickness (the maker lists 0.43 to 6.5 cm)
Sources
BenQ official product page
Scores are calculated only from specs published on official and retail pages.