Building an artificial sun that looks realistic [video]

Post by numpad0 » Wed, Nov 04, 2020, 7:06 AM UTC

jankotek wrote: post #77

db48x wrote: post #62

Earlier quoted context omitted.

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.

It is much easier to take broken lcd screen and remove diffuser. https://m.youtube.com/watch?v=8JrqH2oOTK4

Post by Animats » Wed, Nov 04, 2020, 7:18 AM UTC

db48x wrote: post #62

monktastic1 wrote: post #57

Earlier quoted context omitted.

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 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.)

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.

Post by thekevan » Wed, Nov 04, 2020, 8:00 AM UTC

hinkley wrote: post #64

Why do fresnel reflectors seem to be so hard to find? Seems like they’d be a good option here.

Post by skykooler » Wed, Nov 04, 2020, 8:23 AM UTC

crazygringo wrote: post #45

npunt wrote: post #33

Seems like this idea could scale very well with more LEDs of lower wattage, like a local dimming array in TVs. That way 1. heat would be more evenly distributed reducing the need for large heatsinks 2. smaller fresnel lenses could be positioned much closer to the light reducing thickness 3. with a lot of LEDs there'd be a less noticeable grid at the edges of each fresnel lens from chromatic aberration. I'd totally bu…

Do they make "directional" or "angled" Fresnel lenses? Because you also really want the light to come out of the vertical window at something like a 45° angle downwards. The physics of it should be fine, I've just never heard of them being manufactured. And then just add a translucent blue diffusing layer on top. It seems highly commercializable.

Post by imhoguy » Wed, Nov 04, 2020, 8:53 AM UTC

db48x wrote: post #62

monktastic1 wrote: post #57

Earlier quoted context omitted.

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 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.)

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.