The BenQ ScreenBar Halo solves a problem I didn't know I had: desk lighting without screen glare. A desk lamp puts a bright spot on your screen. The ceiling fan in your office has glare and shadows. The ScreenBar hangs over the top of your monitor and shines light down on your desk in exactly the right angle.
The Halo version (vs. the original ScreenBar) adds backlight and a wireless puck controller, so you can adjust brightness and color temperature without reaching behind your monitor. Automatic ambient-light sensor. USB-powered, so no extra wall wart. Works with curved ultrawides.
I thought it was a gadget. It's actually a tool. Once you've had one, going back to a regular desk lamp feels wrong.