Instead of a simple whiteboard, the Insecure crew makes use of whiteboards with little LED lights inside, called S2 LiteMat 4s. In the very first image up top, a 1-foot-by-3-foot LiteMat at low intensity was put near Rae’s face. According to the cinematographer, “it’s reflecting on her skin rather than ‘lighting’ it.”

https://mic.com/articles/184244/keeping-insecure-lit-hbo-cinematographer-ava-berkofsky-on-properly-lighting-black-faces#.7NugSntr6