Believe me, that's more than enough to photodegrade your toys, even if they're not in the direct path of the sunlight. The sunlight was only getting a few cm and it was enough to yellow the smokestacks on my Jetwing OP.Originally Posted by danny-boy
Here is what the window looks like...
Left: Window's location in my TF room with the semi-exposed part circled. It's really small and tucked into that corner, and yet it was still enough to do some damage, but only to the toy sitting right next to it. None of my other toys have been affected.
Centre: Close-up of the semi-exposed area. As you can see, I've covered it up with a cloth-wall hanging poster and even stuck some pieces of cardboard on the top to shield light from coming through the top gap. You can also see the brown paper sheet that I've recently added; that's attached to the ceiling's skirting. I'm going to attach a second sheet of brown paper to cover that remaining gap and produce complete darkness.
Right: This is a window in a different room, but it's the exact same style and size as the one in my TF room. It comes with a solid roller-blind which works well in blocking out sunlight, but as you can see, without any additional obstructions, the sunlight still shines through around the edges, creating a rectangular halo. It's the upper halo (highlighted in yellow) that I hadn't adequately blocked off before and caused yellowing.
So in my experience, you need to block out ALL sunlight, because even indirect ambient natural sunlight that gets into the room can still yellow plastic. It should be blocked out so well that if you walk into the room in the middle of a sunny day with the lights off, it should be pitch dark as if it's midnight. This is what I had achieved except for that tiny top corner, but that little corner with just a limited amount of soft ambient sunlight was still enough to cause damage! You've gotta treat your toys as if they're even more heliophobic than vampires!
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