Thanks Dawn! I really enjoyed this challenge, and I was taken by surprise too. Just before you sent the prompts I'd been thinking, on a totally unrelated subject, about the Valar being confuddled when they discovered that the vision of Arda had been just that and there was nothing when they arrived. The darkness prompt led to the next and onwards on a little adventure through HoMe. In the end I found Silm quotes for all but one, but it's such fun how different, previously unnoticed things in canon suddenly jump out when looked with a different purpose in mind.

Thank you Wisteria. 

It's very interesting how each light comes from the previous one — except for the light from Melkor's fires (which I'd  never really noticed before doing research for this!) and Varda's stars. Although, cometo thinkof it, she may have been responsible for the mystery shimmering streams of light in the Gloaming, since light was her delight and domain. And although Yavanna sings up the Trees, it's said that when the Valar established Valinor they "gathered great store of light" which may be a remnant from BoLT where it's described in great detail how the spilled light from the lamps was gathered and brought to Valinor and placed in the holes dug for the trees. So it seems to me that she Sang into creation the "vessels" for the Light (like Aulë made the lamps), but not the light itself, in which case it's still from the same original source. 

Thanks Grundy, I'm pleased you like it!