The cable and the price may make you pause.

The BenQ ScreenBar Lite is a portable desk lamp that clips to the screen of a laptop and is powered via USB. It’s the smaller version of the ScreenBar we reviewed last year and is designed for those who need a reliable lamp on the go. The light it spits out is strong, even, and customizable. It features easy-to-use controls, and is well built. But the price ($99 on Amazon) and cable type might put you off.
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https://www.pcworld.com/article/3410299/benq-screenbar-lite-review.html