Help Daydream Beautiful Widget screen is dim

[TobesEtc]

I've got Daydream set to bring up the Beautiful Widget when docked. However, the screen is really dim/dark as soon as the widget activates. It isn't dark for the other options. Under Daydream>BW>Settings I've not got Night selected (though I did try that to see if that was the cause - doesn't seem to be).

Any ideas?