Yes, a bit, but I don't get the larger blotches. Plus the leaves are affected uniformly around the plant. Even the ones at the bottom in shade so I can't see how it could be heat.

I have a fan blowing on the light (it also hits the plants) and if heat - the WW is not affected at all so it doesn't make sense. I just can't figure it out and it doesn't help that I don't have a PPM meter to report the results.