The real problem is that a so-called "RGGB" sensor isn't. It's actually (white-R) white white (white-B). So this isn't a 2x brightness increase: it's barely 10%.
That "white spot" is the ground plane + heat sink for the ethernet/usb hub IC.
Augh. No. Peak power dissipation is not average power dissipation. A laser printer or copier only uses that much power while printing/copying. My laserjet goes down to ~50W in power "saving" mode when it's not printing.
We don't really understand it, so we'll give it to the programmers.