"Could you take a night exposure of distant, dim city lights, or else stars, (or even something inside your house) closed to f/3.5, and post side and top/bottom border crops at 100% sometime? Place or frame, small light sources near the borders..."
I can give it a go. Luckily I moved south in Sweden so it does get dark at night even in the summer. Or well it gets rather dark, not pitch black. At least for two or three hours in the middle of the night... I´m not sure what to look for, so perhaps I´d just send som raw files instead of posting?
Oooo the greens.. I love the "spring greens" They are so full of life. So vibrant in their rather pale tone. Just as you say, high summer greens are more dull. Darker, not so alive. And it´s stressfull because I only have a few weeks to get all the spring images, then I have to wait for a whole year to get a new chance.