Couldn't this be mitigated in a similar fashion to other attacks using low data channels like sensors or CPU timings? By reducing the granularity? By default,

Couldn't this be mitigated in a similar fashion to other attacks using low data channels like sensors or CPU timings? By reducing the granularity? By default, you'd get the averaged ambient light value over a few seconds, and if you really really needed high resolution, you'd need to request escalated privs?