I'm no artist at all, so, I shouldn't be pointing this out, but, have you noticed that the monitors for the block spawners are almost "shining in the dark" ?
Suggestion, make the entire spawner the same way, and only change the front screen

That way, will really look like only the screen is being illuminated
I hope this suggestion being of any use
And... Have you considered applying for the dev team ?

That's a nice work sample you got there =D