New Cree 730nm xp-e emitter!!

C

churchhaze

Well-Known Member
I saw some models on digikey a few weeks ago saying they were far-red, but the datasheets still hadn't been updated...

While in a discussion with a friendly led-lamp salesman in another thread, I was going to link to him the xp-e photo red mcpcb from cutter.... well, cutter has the new cree far-red leds!!

Here's the updated datasheets.

http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/Data and Binning/XLampXPE.pdf

And here's cutters offering!

http://www.cutter.com.au/proddetail.php?prod=cut2200

Great news indeed!
 
C

churchhaze

Well-Known Member
The top bin, XpEFAR‑L1‑0000‑00601, says it has an output of 210mW at 350mA Tj = 25C.

The characteristic curve says that at 350mA, it drops ~1.9V.

Thus the test power is 0.350A * 1.9V = 0.665W

That gives these things an efficiency of 0.210W/0.665W = ~31.6% efficiency.

Not too shabby.
 
Scotch089

Scotch089

Well-Known Member
I'm planning to buy a few of these. How do they stack up to the competitors? I had them bookmarked but got a new phone.

And church- how did you figure the efficiency. I'm sorry I know I've asked supe before but can't remember shiiiiiiit
 
C

churchhaze

Well-Known Member
Scotch089 said:
I'm planning to buy a few of these. How do they stack up to the competitors? I had them bookmarked but got a new phone.

And church- how did you figure the efficiency. I'm sorry I know I've asked supe before but can't remember shiiiiiiit
Click to expand...
To find the efficiency, I simply took the output power over the input power at test current. I'm not taking test Tc conditions into consideration.

The efficiency is on par with the LEDengin LZ4-40R308 Q flux bin, and a bit better than the efficiency of the P bin.

http://www.mouser.com/ds/2/228/LZ4-00R308-318073.pdf
http://www.mouser.com/Search/ProductDetail.aspx?R=LZ4-40R308-0000virtualkey62410000virtualkey897-LZ440R3080000
 
Last edited:
Scotch089

Scotch089

Well-Known Member
Thanks brother. Still a little shady on the efficiency but I'll figure it out some day. Lol wantin to determine the eff of my panel with new emitters (xpls vs. Xml2s)
 
C

churchhaze

Well-Known Member
It's harder to find the efficiency of white leds because they give you lumens, but the 730nm ones list their output flux directly in watts making it really easy to find efficiency in comparison.

The LZ4-40R308 Q bin lists an output of 2.1W when powered at 6.3W so it has an efficiency of 2.1/6.3 = 33% under their test conditions.
 
stardustsailor

stardustsailor

Well-Known Member
Not sure ,but I think the most efficient FR ( 730 nm ) LED unit is this one :

http://www.osram-os.com/osram_os/en/products/product-catalog/leds-for-general-lighting/oslon-ssl-80-colors/gf-cs8pm1.24/index.jsp

With a Vf typ.= 1.85 V and with a 280mW max output @ 350 mA ( power group / bin :4S )....

http://www.osram-os.com/Graphics/XPic6/00158435_0.pdf/GF CS8PM1.24 (EnglishDeutsch).pdf

That would be about 43,24 % radiometric efficiency (best case )...
( Listed typical radiometric efficiency : 36% )
 
stardustsailor

stardustsailor

Well-Known Member
churchhaze said:
If these emitters have as good of efficiency as their 660nm emitters, it's possible multi-narrowband arrays could make a comeback... maybe? Who knows.. but it's great to have options for 730nm!

Set your own R:FR ratio!
Click to expand...
Ok ...
multi-narrowband arrays...
Return from the past ...

Possible issues I can foretell ..

1)The thermal resistance : The typical (real ) thermal resistance of single led units it's somewhere close to 10 K/W these days ...

2)The radiation pattern aka no"disco light effect " .
In order to diminish that effect led diodes should be closely / tightly packed on a such array ..
Go back to #1.

3) Plenty of different monochromatic diodes should be used.
A violet maybe,some deep blues and some blues,some green and yellow and /or ambers
and then the majority at red -deep red ,with plenty of FR .
Nice ...BUt what's the exact ratio? Which leds are going to be chosen ?

NAh...Tough ...Very tough ...Needs channel controls and from "growing" you probably will revert to "experimenting"....

What could be done instead ....
If ,then someone finds a" golden ratio" between all these different types of led dies /diodes /chips and
places them ,nicely arranged in a COB package ,with some-protective -flat transparent Silicone "LES" on top ...
Then the disco light effect AND the thermal resistance problems are almost solved ...
thermal resistance will drop x10 times and no disco effect pattern ,as the silicone LES will ( dif-) " fuse " the different
monochromatic wl lights into a "white" shade of light (white has more than 50 ....Unlike grey :P ...)...

So ...A multi-monochromatic led die COB ,with a transparent "diffusing" LES ,would be probably a highly efficient, horticulture dedicated , of low thermal resistance and high power solid state light ...
Easy to install to a heatsink and blah-blah-blah .....

Still,a stupid simple idea ....But it seems that none (of the related tech manufacturers ) is interested about ...

Cheers.
:peace:
 
C

churchhaze

Well-Known Member
Lucky for our sanity, it's probably way more efficient to use the white cobs anyway, at least for now.

stardustsailor said:
Ok ...
multi-narrowband arrays...
Return from the past ...

Possible issues I can foretell ..

1)The thermal resistance : The typical (real ) thermal resistance of single led units it's somewhere close to 10 K/W these days ...

2)The radiation pattern aka no"disco light effect " .
In order to diminish that effect led diodes should be closely / tightly packed on a such array ..
Go back to #1.

3) Plenty of different monochromatic diodes should be used.
A violet maybe,some deep blues and some blues,some green and yellow and /or ambers
and then the majority at red -deep red ,with plenty of FR .
Nice ...BUt what's the exact ratio? Which leds are going to be chosen ?

NAh...Tough ...Very tough ...Needs channel controls and from "growing" you probably will revert to "experimenting"....

What could be done instead ....
If ,then someone finds a" golden ratio" between all these different types of led dies /diodes /chips and
places them ,nicely arranged in a COB package ,with some-protective -flat transparent Silicone "LES" on top ...
Then the disco light effect AND the thermal resistance problems are almost solved ...
thermal resistance will drop x10 times and no disco effect pattern ,as the silicone LES will ( dif-) " fuse " the different
monochromatic wl lights into a "white" shade of light (white has more than 50 ....Unlike grey :P ...)...

So ...A multi-monochromatic led die COB ,with a transparent "diffusing" LES ,would be probably a highly efficient, horticulture dedicated , of low thermal resistance and high power solid state light ...
Easy to install to a heatsink and blah-blah-blah .....

Still,a stupid simple idea ....But it seems that none (of the related tech manufacturers ) is interested about ...

Cheers.
:peace:
Click to expand...
 
Scotch089

Scotch089

Well-Known Member
@guod hey bud you put cree and epis as the same. Would you elaborate on that I know several companies use the same crap and such. It makes sense since the lz4s and osram are 20 bucks a pop vs 5 for a cree
 
guod

guod

Well-Known Member
cree´s Red, Photored and Farred coming from Epistar.

Taiwan LED wafer manufacturer Epistar announced more good news for its market layout in LED lighting. According to a report by global financial service firm Morgan and Stanley, Epistar’s infiltration into CREE’s supply chain, controlling production of high efficiency red LED chips and mid-to-low watt sapphire wafer orders, lighting proportion within the company will continue to rise for 4Q.
Click to expand...
http://www.ledinside.com/news/2013/9/epistar_infiltrates_cree_supply_chain

Scotch089 said:
@guod hey bud you put cree and epis as the same. Would you elaborate on that I know several companies use the same crap and such. It makes sense since the lz4s and osram are 20 bucks a pop vs 5 for a cree
Click to expand...
 
Greengenes707

Greengenes707

Well-Known Member
image.jpg
What's really interesting is that Osram America...Sylvania...doesn't know that Osram makes a grow panel now. One guy was asking them about growing...they said they don't make anything specific but did bring the chart I just posted over. I jumped in and said...you guys actually do mak a grow fixture....then they told me the two were different companies basically...or they just didn't know and back peddled.
They say that EU and America are differnet in certain thing...having a grow light being one of them aparantly.
 
AquariusPanta

AquariusPanta

Well-Known Member
KarmaPaymentPlan said:
haven't noticed much talk on the flower initiator in a while is everybody still using them?
Click to expand...
They ('flower' initiators) actually reverse plant growth until all the stems and leaves are placed back into the shell of the seed, thus preserving the life of the plant.

I would still recommend the initiator for the pure thrill of watching your beloved plant experiencing the 'Benjamin Button' effect (Tinder, From Plant to Seed, 1974).
 
You must log in or register to reply here.
Top