Exotic COBS ...

stardustsailor

stardustsailor

Well-Known Member
stardustsailor

stardustsailor

Well-Known Member
Alta LED announces High Power 4s horticultural LED light source
Published on: August 27, 2014


Pomona, CA -- Imagine...nighttime turning into day... urban indoor growing under the actual scientific makeup of the sun. It's a technology that produces light at 3200 Kelvin... the closest existing match to the sun, creating the perfect plant spectrum for maximum growing. Many have claimed to have it, none have proven it... until now.


http://www.ledsmagazine.com/ugc/2014/08/27/alta-led-announces-high-power-4s-horticultural-led-light-source.html

http://highpower4s.com/
 
D

DarthBlazeAnthony

Well-Known Member
stardustsailor said:
http://www.ledsmagazine.com/ugc/2014/08/28/tyanshine-photoelectric-upgrade-cob-rgbw-4in1-leds-array-for-entertainmentarchitectural-lighting.html


http://en.txled.cn/fresnelcobledarray.htm

"
  • Three channels,warm white / white/Yellow (or Warm white/White/Red)
  • High CRI 97Ra+
"

........................................


Santa ....
I've been a good grower ...
I would like a Cree COB that has 3000K + 5000K + Photo red ,on it ...
Actually ,I need about a half dozen of them ...
Thank you,Santa ....
Click to expand...
Do you know of a comparable COB chip on ebay?
 
Positivity

Positivity

Well-Known Member
Hp4s..I got excited until I saw they are only selling light fixtures. Probably top dollar for their tech too.

Looks to be the next evolution of led lighting. Horti specific leds...that is. I'm hoping cree steps up and puts one together. And makes the good bins AVAILABLE...lol.

800nm is quite exotic. Is the osram black a example of that? I always wondered what that particular wavelength was for.

Edit...nope oslon black is just a series. Checked on it. Thought I saw the black as an ir once.
They do have a 850nm..not quite.

http://www.compoundsemiconductor.net/article/-Osram-unveils-Oslon-black-850nm-infrared-LED.html
 
Last edited:
FranJan

FranJan

Well-Known Member
Hi SDS, I've been meaning to chat with you about this:
http://www.lightimes.com/documents/view/sectornews.php?sector=ledmod

LED Engin's LuxiTune to Offer White Light Tunability

June 10, 2014...LED Engin, Inc., demonstrated its Generation 3.0, tunable white light engine at Lightfair. LuxiTune Generation 3.0 features a 2200 lumen emitter, equivalent to a 120W halogen lamp. The light engine offers smooth halogen-style dimming from 1600K to 3000K and Correlated Color Temperature (CCT) tuning between 2100K and 4300K. Both tuning curves track the black body curve closely and light intensity (flux) is adjustable from 100% to less than 0.5%. With the company's complementary secondary optic, luminous efficacy is 63 lumens/W at steady-state temperature. The Color Rendering Index (CRI) is 90 at full intensity, and the CRI maintains an average of 85 as the LED is dimmed.

The DALI and DMX compatible light engine provides flicker-free operation with industry-standard analog 0-10V dimmers. According to LED Engin, the light engine's self-learning mode eliminates known issues related to varying voltage drops on long and short cables when multiple lamps are connected to one dimmer. DMX control can switch between CCT tune and halogen dim modes. LuxiTune employs a compact, single emitter to provide warm, soft tones of dimmed light. Throughout the dimming range, LuxiTune maintains color quality and consistency within 3 Standard Deviation Color Matching (SDCM). The multi-channel emitter platform creates more vibrant colors without some of the hue changes experienced with simpler two-color systems. Smart feedback control ensures color and flux stability over the product's lifetime and eliminates the known effects of varying light output over temperature and time from different color dies. Furthermore, the light engine has no perceptible flickering effects in the 100Hz to 200Hz range.

Secondary optics measuring 84mm diameter are available in 24°, 34° and 45° beam angles for compact lighting fixtures. A driver board is mounted remotely, separated from the LED MCPCB in the LuxiTune 3.0. The company points out that this is a particularly useful feature in recessed metal box downlights. A separate emitter allows easier integration into swivel features, and heat from the driver board does not increase the temperature of the LED with the separate emitter. So, reliability and operating life are improved.

LED Engin also offers a 1100 lumen version of the latest LuxiTune, equivalent to a 60W halogen lamp. LuxiTune Generation 3.0 is sampling to key customers now, with volume production ramping in the third quarter of 2014.

So what they are talking about here is true, albeit limited, tunable whites? That would be incredible to add to COB technology if I'm reading this right. Maybe not just now but in the future when performance is geared more toward our needs. Thoughts Είδος ξένος :)?
 
stardustsailor

stardustsailor

Well-Known Member
stardustsailor

stardustsailor

Well-Known Member
Well ...
For sure ,we're witnessing some further advancements an the "Chip on board " or 'Led arrays " "sector" ,
of solid state lighting ...


Different phosphor layering techs ,quantum dots,tunable CCT ,"Hybrid " phosphor cobs with mono-other than blue ones- dies underneath phosphor layer ....and the list is continuously growing larger ....

Fran ,what worries me about those COBs, is their presented ,relatively low luminous efficiency ...
Other than that they seem to bear quite of a R&D ,behind their tech ...

And something I do not really ,understand ,quite well ,with my poor mind ...
" Furthermore, the light engine has no perceptible flickering effects in the 100Hz to 200Hz range."

When our vision can not see almost any of flickering above ~30-35 Hz ....
How a flickering at 100 Hz or even more at 200Hz ,can actually be "perceptible" ?
:?::confused::roll:....

My preference though ,still remains a 'hybrid' COB consisting of phosphor converted ,at about 3000K
(of standard WW 3000 K 'spectrum ' ) along with some deep red dies (pref. @ 670-680 nm ) ,
not under the phosphor layer but on a "zone" or 'perimeter' placement and of course separate driving pads ....

That is my minimal "dream " ....

The whole " nocturnal ......." is a COB ,
bearing both a WW 3000K and a 5000K NW sector,along with deep red and FR
sectors ...

Preferably made by Cree.*

*(Wake up guys....You're the best
.Please ,take our money ,but do make those special "horti arrays" ,for cryin' out loud! )



Cheers
:peace:
 
ficklejester

ficklejester

Well-Known Member
My understanding is that COBs are single diodes containing multiple dies, whereas the multichips are individual diodes, each with their own die.

Please correct me if I'm wrong.
 
P

porco

New Member
MrFlux said:
Anything that has the dies (chips) directly attached to the same substrate can be called a COB. Practically speaking, if it doesn't have through-hole or SMD LEDs, it's a COB.
Click to expand...
That's it, they attach the dies directly to the substrate, every manufacturer has their own way for a better efficacy, and there's no other smt process regarding the dies...
 
heckler73

heckler73

Well-Known Member
stardustsailor said:
Fran ,what worries me about those COBs, is their presented ,relatively low luminous efficiency ...
Other than that they seem to bear quite of a R&D ,behind their tech ...
Click to expand...
The luminous efficacy is low. That should only be a concern if you're trying to match the CIE1931 sensitivity function (same thing with CRI).
Or are you talking about the luminous power efficiency (i.e. lumens : power input)?

And something I do not really ,understand ,quite well ,with my poor mind ...
" Furthermore, the light engine has no perceptible flickering effects in the 100Hz to 200Hz range."

When our vision can not see almost any of flickering above ~30-35 Hz ....
How a flickering at 100 Hz or even more at 200Hz ,can actually be "perceptible" ?
:?::confused::roll:....
Click to expand...
It could be from aliasing effects.
It's the same reason if one is doing some sampling in the lab (e.g. measuring V(t) of a variable source), you can't measure anything higher than 1/2 half your sampling rate.
For example, note the "flicker" in this measurement I made of my light using a BH1750 sensor:
MC LED2.png
My Arduino has a sampling rate of 10kHz max. I think for this component I was reduced to measuring at 5Hz (200ms). So you can see what happens there (in this case, one takes the average).
It could be that which they were referring to when discussing "flicker", not one's eye. Like the videos people make where you can see the interference patterns on the CCD from the light systems.
But I don't know...it's strangely phrased.

The whole " nocturnal ......." is a COB ,
bearing both a WW 3000K and a 5000K NW sector,along with deep red and FR
sectors ...
Click to expand...
Layered phosphors or split?

FranJan said:
And let's not forget these guys too. Slap an Anduino controller on and...........? :)

http://en.honglitronic.com/index.php?m=News&a=new_list_info&nid=14
Click to expand...
Did someone say Arduino? ;)
It would need some FETs to control the input current, though, OR use those controllable transformers! Hmmm...
EDIT: :lol: I just saw their advertising line at the end; "set your stage on fire"
Uhhh... actually, that's the last thing I want to do.
 
lightspectrum

lightspectrum

Member
I understand a "designer light spectrum" is on it's way. I believe that the specific needs of our plants will soon be met, by a company currently working on identifying exactly what light spectrum the plants need at various stages of their development. This company is currently growing in a lab environment to " dial in " the spectrum specific to our plants. Not just an "agri led." Root development, veg, flowering, all have crop specific requirements and using a led designed for commercial production of anything other than marijuana is already giving up too much. Using a "full spectrum" when the plant is wanting a specific light spectrum for its current needs is inefficient.
 
nachooo

nachooo

Well-Known Member
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