The ScreenBar Plus is BenQ's most expensive computer monitor light, retailing at US$129 in the US or £119 in the UK. The ScreenBar Plus has a desktop dial, is USB powered and supports auto-dimming, along with a Hue adjustment.
https://www.notebookcheck.net/BenQ-ScreenBar-Plus-Hands-On-Easy-to-use-and-with-plenty-of-features-but-cables-galore.518326.0.html