Naming:
klight-WHICH-STATE

WHICH:
  bad		2nd hand N900 from Argentina, showing "desktop"
  good		N900-004 MOZILLA2438 EC:9B:5B:C1:FF:A3, freshly
		powered on, somewhere in the initial setup
  both		side-by-side comparison

STATE:
  closed	closed, with key mat in place
  open-VIEW	keyboard frame and key may removed, full backlight as
		  selected by system
  open-VIEW-dimmed
		like open, but system entered a "dimmed" mode
		(Note: didn't notice such a mode on "bad".)

VIEW:
  top		from the top
  angle		from the front, at a flat angle

Notes:

LEDs of "bad" seem to leak more light onto the light spreader, but
it looks less dramatic in real life than on the pictures.

Applying pressure near the LEDs of "bad" did not cause any
perceptible movement and had no effect on light distribution.