231–240 of 243 posts
Really cool! I'm working on a lamp that gives you daylight levels of light indoors (albeit no raleigh scattering and columnated light). On the bright side (pun intended), it's 50,000 lumens instead of ~4500. https://getbrighter.com/
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Then you waste a ton of energy on the conversion and still have the same problem. You won't ever get two regulators at exactly the same voltage. One will always take most of the load. You get around this with load balancing resistors, but that comes with its own set of problems. The way you get around that is to chop up your load into multiple independent power domains. That way each segment is powered exclusively by…
I meant in parallel so both positive terminals are connected to the regular in one node
When you connect them in parallel, the first PSU should detect negative load i.e. actual voltage lather than the target; I have no idea how real-world devices handle that condition.
The second PSU will detect load i.e. actual voltage smaller than the target one, will probably assume it happens because the load is pulling energy and will try to extract more power form the AC source to compensate, to make the output stay at the +12.1V target.
I’m not an expert electronics engineer, but to me the approach looks like a recipe for disaster.
It’s usually fine to connect chemical batteries in parallel for two reasons. They have that discharge curve i.e. the voltage decreases monotonously while discharging. If one of them has slightly higher initial voltage, will discharge until matched with the other one, and then both will discharge at about the same rate. Also, chemical batteries have ~fixed internal resistance i.e. the more current you pull from one, the less voltage you get due to that internal resistance.
AC to DC power supplies don’t have a discharge curve because nothing to discharge, they continuously pull energy from the input AC. They don’t have the concept of internal resistance either: when more output current is pulled from them (i.e. the load increases), they simply increase input current from AC (to a point, and then either a fuse blows up or the device catches fire). The dependency between output current and output voltage is not necessarily monotonous. But the worst of it, it depends on time because capacitors, also because the input is single-phase AC i.e. at some moments of time the input power is zero because the input AC voltage and current are zero.
Really cool! I'm working on a lamp that gives you daylight levels of light indoors (albeit no raleigh scattering and columnated light). On the bright side (pun intended), it's 50,000 lumens instead of ~4500. https://getbrighter.com/
Really cool! I'm working on a lamp that gives you daylight levels of light indoors (albeit no raleigh scattering and columnated light). On the bright side (pun intended), it's 50,000 lumens instead of ~4500. https://getbrighter.com/
I'm 100% your audience for this, all I want is for it to be able to automatically adjust it's color temperature throughout the day and I'd replace every Hue bulb in my house with it - can it do that?
Very cool. I’m the CEO of Innerscene ( https://innerscene.com ) and we make a commercial artificial skylight that uses some of these concepts. Actually the coelux ht25 model is almost identical to what you made but using smaller lenses and more LEDs - however the effect they were able to achieve still isn’t that great, the sun looks like a giant orb and once you get a few feet away you can make out a sun at all. We s…
I suspect that there are other people like me out there. Forcing me to talk to an agent to just get an idea of the price, even if I'm willing to pay a fair amount, is an automatic pass. A buy now button though, I'd be willing to do that and then discuss anything else.
Very cool. I’m the CEO of Innerscene ( https://innerscene.com ) and we make a commercial artificial skylight that uses some of these concepts. Actually the coelux ht25 model is almost identical to what you made but using smaller lenses and more LEDs - however the effect they were able to achieve still isn’t that great, the sun looks like a giant orb and once you get a few feet away you can make out a sun at all. We s…
I never heard of this concept until this post, maybe because I live in a sunny country (Brazil) but I can totally see the use case for countries in higher latitudes, as the sun setting at 3pm mist be quite depressing for people. I wonder if you guys did any research on the effects of having your product in these countries. How much would the impact on well being be?
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We provide full 1nm resolution SPDs in our download section so you can do any kind of calculations you want. Worth noting the SPDs change a lot depending on the color temperature of the light. In terms of similarity, trying to match sunlight exactly is not ideal because UV is bad for you and IR is a lot of water energy that can be produced in other ways more efficiently. For energy efficiency we focus on the spectrum…
I have a bunch of related questions so I will drop them all here: * You mentioned focusing the spectrum on humans, but I have always wanted to have light that works well for both humans and plants (e.g. houseplants) as they are also beneficial for human spaces. Why not do both? * Exposure to near IR has significant health benefits and seems like it should be included in an ideal lighting fixture that attempts to repl…
Yuji is similar to a lot of Chinese brands doing something similar which is a backlit Raileigh Scattering panel. The show images of the sun in their marketing and sharp sunbeams on the wall, but these are complete fiction. The also advertise color tuning, but the only natural color they can produce is a blue because Rayleigh Scattering doesn't allow very good color control. Still, for some applications like wall washing if you don't need a dynamic sky color and you can hide the view of the sun it could be a reasonable option.
We haven't researched plants a ton, but did some test to confirm they can grow under this light. Here is a cool time lapse video showing this in action: https://www.youtube.com/watch?v=2TDIVnXfE9I
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I just want to emphasize how important it is for you to not be in the room with it when it's on. It can seriously damage you. There are stories of them being used at parties cause they looked cool and 12 hours later everyone is in the hospital cause it feels like their eyes are melting in permanent lava, their exposed skin is severely burned, it sounds like a horrible experience. Safety precautions are essential beca…
Thank you for the detailed warning. I actually decided to let go of this idea after OP’s warning and reading a bit about it. Because one problem will be that I will have to enter to switch off and on and even though it could be a short lived exposure I was scared. Though I’d read more on this what it could kill in the room. The thing is it might not help anyway. It is seasonal/situational and it happens in other plac…
Very cool. I’m the CEO of Innerscene ( https://innerscene.com ) and we make a commercial artificial skylight that uses some of these concepts. Actually the coelux ht25 model is almost identical to what you made but using smaller lenses and more LEDs - however the effect they were able to achieve still isn’t that great, the sun looks like a giant orb and once you get a few feet away you can make out a sun at all. We s…
Not joking. Do these artificial sunlights help with the allergies? If yes and if it's not insanely costly I'd just try to get something like that for my bedroom during allergy seasons which most often coincides with no sun (winter, rain here). Even in those seasons when the sun comes out in its glory, the allergies (which mostly is my nose turning into an infinite source of salt water), which were driving me stark ra…
Honestly this area is so interesting to me because of how incredibly strongly light (or lack thereof) affects in the winter. It also seems to affect me more strongly than most in regards to sleeping patterns. Too much blue light in the evening and bam, brain refuses to sleep until 2am or later. So for me the biggest factor missing in these kinds of projects is a dynamic color temperature. While we get that from produ…
This is the reason I decided to use 4000K instead of the more physically accurate 5400K. I picked a less middle of the day color temperature and closer to evening time, basically. I spent a lot of time looking at LED suppliers and there's quite a range of options in terms of color temperature. Some manufacturers even have 2 color temps on the same LED package, meaning you can sort of do what you describe by mixing tw…
Currently my favorite bulbs are the ones that are as you describe- two LEDs, one as high as 6500k and one as low as 2200k and it mixes depending on the state of the dinner. Automateable!