6 ms·

In a sci-fi future where people are making long journeys on spaceships I can imagine rooms decked out with these to mimic a natural day/night cycle and outdoor

In a sci-fi future where people are making long journeys on spaceships I can imagine rooms decked out with these to mimic a natural day/night cycle and outdoor spaces. I remember first seeing lights like these a couple years back before from CoeLux (https://www.coelux.com https://www.coelux.com), iirc theirs are very expensive though. Awesome that this guy managed to DIY one!

PTOB 6y ago
I looked into it for a client's commercial building. $40k each for parts only.
- konjin 6y ago
  A computer chip costs $1 billion to make. A billion of them cost $1.1 billion to make.
  - PTOB 6y ago
    Too right!
- h0l0cube 6y ago
  I had a room in an apartment that had no sunlight, and was lusting after CoeLux after it launched. Almost goes without saying, but the first to manufacture an affordable solution at scale would make a ludicrous amount of money, especially with much of the world in lockdown. Low dose UV light would also be a good addition.
  - nitrogen 6y ago
    Low dose UV light would also be a good addition. I'd also like a bit of optional IR so you get a tiny bit of that toasty sun feeling if you want it.
    - konjin 6y ago
      If you use a parabolic reflector and can prescatter the light it's as easy as adding another light source.
tootie 6y ago
Especially if they emit the UVB light we need for Vit D production
- gruez 6y ago
  I thought the official advice was to get supplemental vitamin d through oral supplements, rather than through artificial UV lamps? https://www.nhs.uk/live-well/healthy-body/how-to-get-vitamin-d-from-sunlight/ https://www.nhs.uk/live-well/healthy-body/how-to-get-vitamin... >Using sunbeds isn't a recommended way of making vitamin D.
  - deleted 6y ago
    [deleted]
  - tootie 6y ago
    There's at least some evidence that LEDs can be more effective than sunlight at synthesizing D. There's a specific wavelength of light that triggers it and I'm not sure if a standard tanning bed emits it. https://www.nature.com/articles/s41598-017-11362-2 https://www.nature.com/articles/s41598-017-11362-2
  - dzhiurgis 6y ago
    FWIW there's not evidence vitamin D supplements have any health impact (asides from crickets).
    - faceplanted 6y ago
      Aside from _in_ crickets experimentally, or aside from crickets as in you hear nothing?
      - bearbin 6y ago
        rickets, not crickets
        6y ago
deleted 6y ago
[deleted]
monktastic1 6y ago
Riding the coattails of your comment to ask the hive mind: any reason I shouldn't try to build the simpler version from the tutorial using a more powerful (100W) LED from Amazon? https://www.amazon.com/dp/B07T8RDF8F https://www.amazon.com/dp/B07T8RDF8F Might not be as awesome as a $60k CoeLux, but for 1000x less cost, maybe it's worth a shot? (Edit: come to think of it, with an 8x10 fresnel lens, it might be way too bright for the size.)
- jtanderson 6y ago
  You'd still have to deal with the glare and chromatic aberration from the mirror sheets. Also the area covered would still be confined to the size of one sheet and you'd have to make a "bank" of them to cover any reasonably large area.
- db48x 6y ago
  Don't forget that the volume of the device has a cost too. The video shows the construction of a really really nice, but takes up the whole hallway outside that room. Most of the time you'd probably prefer to use your hallway for walking in. On the other hand, maybe your house has an attic above one of your rooms that; there will be a lot less opportunity cost to using up that volume.
  - jankotek 6y ago
    It is much easier to take broken lcd screen and remove diffuser. https://m.youtube.com/watch?v=8JrqH2oOTK4 https://m.youtube.com/watch?v=8JrqH2oOTK4
    - numpad0 6y ago
      That’s the same guy as this article link. This one is supposed to be an improvement over that.
    - ecef9-8c0f-4374 6y ago
      the point of the parabolic reflector/fresnel versions are the parallel rays
msla 6y ago
Spaceships? I can imagine these things in Alaska: https://en.wikipedia.org/wiki/Whittier,_Alaska https://en.wikipedia.org/wiki/Whittier,_Alaska > Whittier is a city at the head of the Passage Canal in the U.S. state of Alaska, about 58 miles (93 km) southeast of Anchorage.[6] The city is within the Chugach Census Area, one of the two entities established in 2019 when the former Valdez–Cordova Census Area was dissolved.[7] At the 2010 census the population was 220, up from 182 in 2000. The 2018 estimate was 205 people, almost all of whom live in a single building, the Begich Towers. https://en.wikipedia.org/wiki/Begich_Towers https://en.wikipedia.org/wiki/Begich_Towers > The Begich Towers Condominium is a building in the small city of Whittier, Alaska. The structure is notable for operating like a small-scale arcology, being the residence for nearly the entire population of the city, as well as containing many of its public facilities. This has earned Whittier the nickname of a "town under one roof".

PTOB 6y ago

I looked into it for a client's commercial building. $40k each for parts only.

konjin 6y ago
A computer chip costs $1 billion to make. A billion of them cost $1.1 billion to make.
- PTOB 6y ago
  Too right!
h0l0cube 6y ago
I had a room in an apartment that had no sunlight, and was lusting after CoeLux after it launched. Almost goes without saying, but the first to manufacture an affordable solution at scale would make a ludicrous amount of money, especially with much of the world in lockdown. Low dose UV light would also be a good addition.
- nitrogen 6y ago
  Low dose UV light would also be a good addition. I'd also like a bit of optional IR so you get a tiny bit of that toasty sun feeling if you want it.
  - konjin 6y ago
    If you use a parabolic reflector and can prescatter the light it's as easy as adding another light source.

tootie 6y ago

Especially if they emit the UVB light we need for Vit D production

gruez 6y ago
I thought the official advice was to get supplemental vitamin d through oral supplements, rather than through artificial UV lamps? https://www.nhs.uk/live-well/healthy-body/how-to-get-vitamin-d-from-sunlight/ https://www.nhs.uk/live-well/healthy-body/how-to-get-vitamin... >Using sunbeds isn't a recommended way of making vitamin D.
- deleted 6y ago
  [deleted]
- tootie 6y ago
  There's at least some evidence that LEDs can be more effective than sunlight at synthesizing D. There's a specific wavelength of light that triggers it and I'm not sure if a standard tanning bed emits it. https://www.nature.com/articles/s41598-017-11362-2 https://www.nature.com/articles/s41598-017-11362-2
- dzhiurgis 6y ago
  FWIW there's not evidence vitamin D supplements have any health impact (asides from crickets).
  - faceplanted 6y ago
    Aside from _in_ crickets experimentally, or aside from crickets as in you hear nothing?
    - bearbin 6y ago
      rickets, not crickets
      - 6y ago

deleted 6y ago

[deleted]

monktastic1 6y ago

Riding the coattails of your comment to ask the hive mind: any reason I shouldn't try to build the simpler version from the tutorial using a more powerful (100W) LED from Amazon? https://www.amazon.com/dp/B07T8RDF8F https://www.amazon.com/dp/B07T8RDF8F Might not be as awesome as a $60k CoeLux, but for 1000x less cost, maybe it's worth a shot? (Edit: come to think of it, with an 8x10 fresnel lens, it might be way too bright for the size.)

jtanderson 6y ago
You'd still have to deal with the glare and chromatic aberration from the mirror sheets. Also the area covered would still be confined to the size of one sheet and you'd have to make a "bank" of them to cover any reasonably large area.
db48x 6y ago
Don't forget that the volume of the device has a cost too. The video shows the construction of a really really nice, but takes up the whole hallway outside that room. Most of the time you'd probably prefer to use your hallway for walking in. On the other hand, maybe your house has an attic above one of your rooms that; there will be a lot less opportunity cost to using up that volume.
- jankotek 6y ago
  It is much easier to take broken lcd screen and remove diffuser. https://m.youtube.com/watch?v=8JrqH2oOTK4 https://m.youtube.com/watch?v=8JrqH2oOTK4
  - numpad0 6y ago
    That’s the same guy as this article link. This one is supposed to be an improvement over that.
  - ecef9-8c0f-4374 6y ago
    the point of the parabolic reflector/fresnel versions are the parallel rays

msla 6y ago

Spaceships? I can imagine these things in Alaska: https://en.wikipedia.org/wiki/Whittier,_Alaska https://en.wikipedia.org/wiki/Whittier,_Alaska > Whittier is a city at the head of the Passage Canal in the U.S. state of Alaska, about 58 miles (93 km) southeast of Anchorage.[6] The city is within the Chugach Census Area, one of the two entities established in 2019 when the former Valdez–Cordova Census Area was dissolved.[7] At the 2010 census the population was 220, up from 182 in 2000. The 2018 estimate was 205 people, almost all of whom live in a single building, the Begich Towers. https://en.wikipedia.org/wiki/Begich_Towers https://en.wikipedia.org/wiki/Begich_Towers > The Begich Towers Condominium is a building in the small city of Whittier, Alaska. The structure is notable for operating like a small-scale arcology, being the residence for nearly the entire population of the city, as well as containing many of its public facilities. This has earned Whittier the nickname of a "town under one roof".