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Interestingly I posted this 2 days ago but it dropped into the ether. Ever since I seen it I've become convinced something similar will be part of a future garden office I'm planning. With a IR panel heater to add the warming effect. I was also wondering about whether UVB could be incorporated by but frankly I'd be too chicken to mess with that.
Wow. For some reason I thought it is already product on market with ton of alternatives. Fascinating.
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autocorrect fail: it's "watts"; 250W & 400W are two common size for metal halide lamps. Unfortunately they are full of mercury and can explode at end of life.
wouldn't that put out a lot of heat? like a lot a lot? that's one of the attractions of LEDs for lighting is they can produce a hell of a lot of light with very little heat coming from the bulb. all of the heat is in the electronics in the back. anything in front of the light will not wilt. of course, i'm thinking in terms of photo/video.
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wouldn't that put out a lot of heat? like a lot a lot? that's one of the attractions of LEDs for lighting is they can produce a hell of a lot of light with very little heat coming from the bulb. all of the heat is in the electronics in the back. anything in front of the light will not wilt. of course, i'm thinking in terms of photo/video.
LEDs as you can see in the video aren't as efficient as you might think, since he has a HUGE heat sink / water pump system in place
Leds aren’t a good source of full spectrum light. Metal hallide bulbs are the way to go. 250-400 ways worth has a fantastic warm glow. Bonus points you can grow stuff under them really well
... that looks realistic to a digital camera that doesn't record with high dynamic range?
Yes, he's biassed. No, that doesn't mean he was lying. The realism is about the subjective experience. If you went into the room, you probably would feel "this isn't bad" before you went to Meh.
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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.
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 ), iirc theirs are very expensive though. Awesome that this guy managed to DIY one!
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
> 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".
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The method proposed in the video already accounts for the narrow LED spectra by using lights that have excellent color reproduction (the part where he recommends a CR rating of 95%+)
It's not really good enough: https://www.oscars.org/science-technology/sci-tech-projects/... Mixing violets and greens makes the spectral curve closer to that of sunlight. Again, without seeing it in person there is no way to know how much impact this has. Using a parabolic reflector however is the only way to go since you will not get diffraction or blocking of wavelengths.
I wonder if you could make a better fresnel version, with less chromatic aberration by using a more expensive lens? The parabolic version is cool, but extremely unwieldily... Also, are there fresnel lenses with a much shorter focal length? The dream would be to have something like this in a ≈ 10 cm (4 in) thick picture frame hung on the wall...
The lenses I've seen at EO have focal lengths that aren't much shorter than the side length---20cm for 25cm sheets. I'm pretty sure this is a limitation on the refractive index plus maybe the precision required for steep incidence angles.