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I haven't seen either product in person, but from looking at youtube videos of both, it seems like CoeLux has a clearly defined, properly round sun, while with

by Darthy 7y ago

I haven't seen either product in person, but from looking at youtube videos of both, it seems like CoeLux has a clearly defined, properly round sun, while with your product, the sun looks fuzzy and cross-shaped, like viewed through a diffraction grating [1]. Am I correct in this characterization? [0] https://youtu.be/EM8psaLBsr8?t=112 https://youtu.be/EM8psaLBsr8?t=112 [1] https://youtu.be/_GYpxeum12U?t=138 https://youtu.be/_GYpxeum12U?t=138

jclarkcom 7y ago
Good observation. That is an older video from a prototype - take a look at this: https://www.dropbox.com/s/7dwa7mj39rpely6/facia%20and%20mullion.mp4?dl=0 https://www.dropbox.com/s/7dwa7mj39rpely6/facia%20and%20mull... I'd say they are pretty similar, Coelux may be slightly less diffusive but it's beam divergence angle is pretty high so it doesn't hold up for very much distance compared to ours - you can see it spreads out into a non-rectangular shape on the wall.
- Darthy 7y ago
  Fascinating. Is it correct that with both implementations, you cannot move the virtual sun around - it's always shining from the exact same angle?
  - tropo 7y ago
    Likely, but it isn't too hard to imagine how that could be fixed for an even greater cost. I wonder how the two products work. I'd probably shine an array of narrow-beam LEDs through a sheet of aerogel. (the aerogel disperses the blue light) If the LEDs are on long horizontal rods that can rotate, that lets the angle change. You'd need the beams focused down to about half a degree, with at least a dozen viewed in a circle of that size from the perspective of a tall person under the light. Another way is just an RGB array, with different lenses on the different colors. The blue gets a fish-eye lens, while the green and red get focused down to about half a degree. Again there can be rods that rotate, and at least a dozen LEDs need to be in a circle of half a degree when viewed by a tall person under the light.
  - jclarkcom 7y ago
    the sun follows you in the sky as you move around but it's angle doesn't change throughout the day.

by Darthy 7y ago

jclarkcom 7y ago

Good observation. That is an older video from a prototype - take a look at this: https://www.dropbox.com/s/7dwa7mj39rpely6/facia%20and%20mullion.mp4?dl=0 https://www.dropbox.com/s/7dwa7mj39rpely6/facia%20and%20mull... I'd say they are pretty similar, Coelux may be slightly less diffusive but it's beam divergence angle is pretty high so it doesn't hold up for very much distance compared to ours - you can see it spreads out into a non-rectangular shape on the wall.

Darthy 7y ago
Fascinating. Is it correct that with both implementations, you cannot move the virtual sun around - it's always shining from the exact same angle?
- tropo 7y ago
  Likely, but it isn't too hard to imagine how that could be fixed for an even greater cost. I wonder how the two products work. I'd probably shine an array of narrow-beam LEDs through a sheet of aerogel. (the aerogel disperses the blue light) If the LEDs are on long horizontal rods that can rotate, that lets the angle change. You'd need the beams focused down to about half a degree, with at least a dozen viewed in a circle of that size from the perspective of a tall person under the light. Another way is just an RGB array, with different lenses on the different colors. The blue gets a fish-eye lens, while the green and red get focused down to about half a degree. Again there can be rods that rotate, and at least a dozen LEDs need to be in a circle of half a degree when viewed by a tall person under the light.
- jclarkcom 7y ago
  the sun follows you in the sky as you move around but it's angle doesn't change throughout the day.