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I can't believe an LED that adapts the colour temperature to the time of the day like F.lux does isn't a standard yet. LEDs are great but boy are they agressiv

I can't believe an LED that adapts the colour temperature to the time of the day like F.lux does isn't a standard yet. LEDs are great but boy are they agressive to the eyes. (Yes that's a bit unrelated, I figured I'd rant and hope some poeple starts mass proucing it thanks to my message)

TheSpiceIsLife 10y ago
I have no trouble getting hold of 2700K LED bulbs here in Australia. I agree though, the cold white 4500K or higher bulbs are really only suitable during the day. Every bulb in my house, CFL or LED, is 2700K.
- Obi_Juan_Kenobi 10y ago
  The difference between a 2700k and 3000k bulb can be quite large, too. I prefer the ones I've gotten labelled 2700k, 40w equivalent. Better LED bulbs also have better power supplies, and therefore less ripple.
lucaspiller 10y ago
I just ordered a some from Osram Lightify that you can control the colour temperature and brightness. I'm going to set them up with Home Assistant to do exactly this, and at €20/bulb (for GU10) they aren't too bad (compared to the coloured Philips Hue which are €60/bulb). However as you say, it would be great if the bulbs would just do this themselves.
TeMPOraL 10y ago
I changed my apartment recently and replaced all bulbs with Hue. Thanks for another idea to my list of hacks I'm trying to implement on them. Hue has a nice RESTful API that works over local network - I so far managed to get Tasker on Android to talk into it, and I'm moving to build a more advanced control centre on a Raspberry Pi.
Bromskloss 10y ago
Are LEDs aggressive to the eyes even if you manage to get them to have the same colour as ordinary light bulbs?
- Noseshine 10y ago
  You mean spectrum - a big difference. "Color" means little or nothing. Very different spectra can have the same "color". I highly recommend reading through this, very educational about how complicated "vision" really is: http://webvision.med.utah.edu/book/part-vii-color-vision/color-vision/ http://webvision.med.utah.edu/book/part-vii-color-vision/col... It's a long read but well worth it. "Color" is something your brain creates, it's not "physical". Frequencies of light of course are a (the) major input, but it's not in any way a straightforward 1:1 one.
  - Bromskloss 10y ago
    I mean colour, not spectrum. I don't expect, or at least don't count on, LEDs to reproduce a black-body spectrum. I recognise that two light sources with the same colour, but different spectra, might give different results when reflected off things. Is that what you had in mind?
    - dr_zoidberg 10y ago
      I think he meant that 2 things having the same colour, but different spectrum, can have different effects on your vision (and body?). The example that most easily comes to my mind is a LED screen representing a yellow colour, versus a lemon under the sun. Shame he didn't elaborate, it seemed to be an interesting topic.
    - Noseshine 10y ago
      Every light source produces a spectrum - even a laser, albeit only small one. Have a look at this link: http://www.soundandvision.com/content/led-vs-cfl-bulbs-color-temp-light-spectrum-and-more http://www.soundandvision.com/content/led-vs-cfl-bulbs-color... As you can see a lot of LEDs have quite a lot of blue. Which is exactly what is responsible for synchronizing your own "clock": http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831986/ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831986/ > Not only does light reset the human circadian rhythm, but the same blue > light that has the strongest impact on dinoflagellates has equal power > to reset our own clocks — although most visible wavelengths can reset > the clock, the blues do the job with the greatest efficiency. Which is the whole reason f.lux became so popular.
legulere 10y ago
Also brightness. At night you just need a bit of light so you can still see stuff, without the light disturbing your circadian rhythm. At daytime you want the light to be much much brighter.

TheSpiceIsLife 10y ago

I have no trouble getting hold of 2700K LED bulbs here in Australia. I agree though, the cold white 4500K or higher bulbs are really only suitable during the day. Every bulb in my house, CFL or LED, is 2700K.

Obi_Juan_Kenobi 10y ago
The difference between a 2700k and 3000k bulb can be quite large, too. I prefer the ones I've gotten labelled 2700k, 40w equivalent. Better LED bulbs also have better power supplies, and therefore less ripple.

lucaspiller 10y ago

I just ordered a some from Osram Lightify that you can control the colour temperature and brightness. I'm going to set them up with Home Assistant to do exactly this, and at €20/bulb (for GU10) they aren't too bad (compared to the coloured Philips Hue which are €60/bulb). However as you say, it would be great if the bulbs would just do this themselves.

TeMPOraL 10y ago

I changed my apartment recently and replaced all bulbs with Hue. Thanks for another idea to my list of hacks I'm trying to implement on them. Hue has a nice RESTful API that works over local network - I so far managed to get Tasker on Android to talk into it, and I'm moving to build a more advanced control centre on a Raspberry Pi.

Bromskloss 10y ago

Are LEDs aggressive to the eyes even if you manage to get them to have the same colour as ordinary light bulbs?

Noseshine 10y ago
You mean spectrum - a big difference. "Color" means little or nothing. Very different spectra can have the same "color". I highly recommend reading through this, very educational about how complicated "vision" really is: http://webvision.med.utah.edu/book/part-vii-color-vision/color-vision/ http://webvision.med.utah.edu/book/part-vii-color-vision/col... It's a long read but well worth it. "Color" is something your brain creates, it's not "physical". Frequencies of light of course are a (the) major input, but it's not in any way a straightforward 1:1 one.
- Bromskloss 10y ago
  I mean colour, not spectrum. I don't expect, or at least don't count on, LEDs to reproduce a black-body spectrum. I recognise that two light sources with the same colour, but different spectra, might give different results when reflected off things. Is that what you had in mind?
  - dr_zoidberg 10y ago
    I think he meant that 2 things having the same colour, but different spectrum, can have different effects on your vision (and body?). The example that most easily comes to my mind is a LED screen representing a yellow colour, versus a lemon under the sun. Shame he didn't elaborate, it seemed to be an interesting topic.
  - Noseshine 10y ago
    Every light source produces a spectrum - even a laser, albeit only small one. Have a look at this link: http://www.soundandvision.com/content/led-vs-cfl-bulbs-color-temp-light-spectrum-and-more http://www.soundandvision.com/content/led-vs-cfl-bulbs-color... As you can see a lot of LEDs have quite a lot of blue. Which is exactly what is responsible for synchronizing your own "clock": http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831986/ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831986/ > Not only does light reset the human circadian rhythm, but the same blue > light that has the strongest impact on dinoflagellates has equal power > to reset our own clocks — although most visible wavelengths can reset > the clock, the blues do the job with the greatest efficiency. Which is the whole reason f.lux became so popular.

legulere 10y ago

Also brightness. At night you just need a bit of light so you can still see stuff, without the light disturbing your circadian rhythm. At daytime you want the light to be much much brighter.