Noel, I love them too, but don't take enough of them.
I think what I like about them is that they look close enough to natural light but something about them catches the eye of observant viewers, and they have a little 'what's going on there' thought happen. I took some not far away from the desert shot I posted here the other day
link and they're quite surreal. Biggest issue is long exposure and moving foliage which is evident but not too bad in your shots.
Of yours, #2 is the one I'd pick - better colour and interesting detail.
Mike