4 ms·

What I'm trying to achieve is lighting a bit like in these "Artificial Skylight" concepts: https://architizer.com/blog/practice/materials/let-there-be-light-coe

What I'm trying to achieve is lighting a bit like in these "Artificial Skylight" concepts: https://architizer.com/blog/practice/materials/let-there-be-light-coelux/ https://architizer.com/blog/practice/materials/let-there-be-... They claim their technology is about "Rayleigh scattering" but I think that's mostly marketing mumbo jumbo. Sure that might add a bit of diffuse blue but their main secret, I would bet, is parallel rays which explains why their fixtures require so much space above the ceiling to get around conservation of etendue. The effect of parallel rays and sharp shadows are definitely represented in their example pictures.

vvladymyrov 2y ago
I’ve installed 4 similar skylight lamps to the basement. Bought them on Amazon for 700$ each (had to replace 1 because it had uneven light). They make basement light much closer to ourdoor light and made basement very cozy and comfortable. I had depth space in the ceiling, but width of the lamp didn’t fit between joists - so could not push lamp all the way at the ceiling level. End up building nice boxing around lamp. So it was medium complexity project with great result.
bmelton 2y ago
I'd wager they're pretty good. If you can leverage a parabolic reflector at a light's focal length, you can get them to collimate in a way that approximates the sun by appearing to be pinned near-infinitely far away. The reflector is generally what takes up the space, but it's necessary(ish) -- you could approximate the effect by using a fresnel lens at the light's focal length, but it yields a smaller light with rainbowing effects. [This video](https://www.youtube.com/watch?v=6bqBsHSwPgw&t=843s https://www.youtube.com/watch?v=6bqBsHSwPgw&t=843s) does a good job of showing how to make your own, as well as illustrating how good the effect is, while also demonstrating why space-hog implementations are likely to yield good results and slimmer ones not.
nothrabannosir 2y ago
Reminds me of this old dyi video about using decommissioned led monitors to create light boxes with parallel rays to emulate sunlight: https://www.youtube.com/watch?v=8JrqH2oOTK4 https://www.youtube.com/watch?v=8JrqH2oOTK4

vvladymyrov 2y ago

I’ve installed 4 similar skylight lamps to the basement. Bought them on Amazon for 700$ each (had to replace 1 because it had uneven light). They make basement light much closer to ourdoor light and made basement very cozy and comfortable. I had depth space in the ceiling, but width of the lamp didn’t fit between joists - so could not push lamp all the way at the ceiling level. End up building nice boxing around lamp. So it was medium complexity project with great result.

bmelton 2y ago

I'd wager they're pretty good. If you can leverage a parabolic reflector at a light's focal length, you can get them to collimate in a way that approximates the sun by appearing to be pinned near-infinitely far away. The reflector is generally what takes up the space, but it's necessary(ish) -- you could approximate the effect by using a fresnel lens at the light's focal length, but it yields a smaller light with rainbowing effects. [This video](https://www.youtube.com/watch?v=6bqBsHSwPgw&t=843s https://www.youtube.com/watch?v=6bqBsHSwPgw&t=843s) does a good job of showing how to make your own, as well as illustrating how good the effect is, while also demonstrating why space-hog implementations are likely to yield good results and slimmer ones not.

nothrabannosir 2y ago

Reminds me of this old dyi video about using decommissioned led monitors to create light boxes with parallel rays to emulate sunlight: https://www.youtube.com/watch?v=8JrqH2oOTK4 https://www.youtube.com/watch?v=8JrqH2oOTK4