One of the themes that seems to have been introduced in the film adaptation of The Hobbit, is the contrast between different types of light. Two instances unique to the film adaptation come to mind.
When Kili speaks to Taurial, he calls star light cold and distant, preferring warm torch light or the firey hunter's moon in his story. Taurial has the reverse preference, favouring 'pure' star light.
Kili: Sounds like quite a party you're having up there.
Tauriel: It is Mereth Nuin Giliath; The Feast of Starlight. All light is sacred to the Eldar, but the Wood Elves loves best the light of the stars.
Kili: I always thought it is a cold light, remote and far away.
Tauriel: It is memory, precious and pure.
Tauriel: Like your promise.
[she holds his stone in her hand and he takes it back, she turns and looks up]
Tauriel: I have walked there sometimes, beyond the forest and up into the night. I have seen the world fall away and the white light forever fill the air. Kili: I saw a fire moon once. It rose over the pass near Dunland. Huge! Red and gold it was, it filled the sky. We were an escort for some merchants from Ered Luin, they were trading in silverwork for furs. We took the Greenway south, keeping the mountain to our left, and then it appeared. This huge fire moon lighting our path. I wish I could show you...
When the door is opened by the last light on Durin's day, it is not to sunlight, nor a warm hunter's moon but cold ethereal moon light.
The only similar use of lighting in the book I can recall is the sunlight that petrifies the trolls.
This play on lighting seems to parallel the difference between Dwarves and Elves. Did Peter Jackson deliberately introduce this theme/cinematic device? Or did this nuance exist in the original?