I hadn’t yet visited tutorial world for this and have been wondering something similar myself with respect to visually rendering the effects of a “flash grenade” as popularized by SWAT team depictions.
My thought was to put a smallish sized UV sphere with an emission node set way high in something not quite white in color. (orangish? yellowish?)
My one and only experience seeing a flash-bang demonstrated was the color of the light it gave off was in the orange area of the color wheel.
Am I on the right track with my approach. (Using Cycles render)