stop lecturing and think for a minute you were trying to blow off far red light as insignificant for the plant. Its not, and then you bitch about being OLD NEWS.
well sorry but I just happen to be in plant physiology R&D since the 70s
Bridgelux Gen2 BXEB-L0560Z-30E2000-C-B3 First Look
- Thread starter GrowLightResearch
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well sorry but I just happen to be in plant physiology R&D since the 70s
your ass backwards dude. the 620nm rating is to fool humans not plants
GrowLightResearch
Well-Known Member
Not true. I said Fr is not for photosynthesis. And went on to mention photomorphogenics. Meaning there are many other aspects to far red, far from insignificant.
Nothing may have been the wrong word. It certainly has an effect on electron transport and secondary metabolites.
I certainly was not coming on as a know it all and specifically said so:
I was not lecturing, you came on strong towards me tell me to look at ancient news like I was an imbecile. I have my issues and diplomacy is something I am working on. I'm sorry if I offended you, that was not my intent. I have issues, the voices in my head have voices.
GrowLightResearch
Well-Known Member
you're*
You nailed it, very true. Born breech.
uh huh
actually both statements are true
"you are ass backwards"
"your ass (is) backwards"
whichever you prefer ... but really the osram datasheet with the 620 nm rating is trying to normalize a "relative SPD" to what a human eye sees
not the other way around
nfhiggs
Well-Known Member
That makes sense to me - the human eye would be more sensitive to 620 than 650 so that frequency (620) would appear brighter even if its fewer photons than 650.
alesh
Well-Known Member
Dominant wavelength is the wavelength that produces most lumens (that means it's adjusted to human eyes). GR PSLR31.13 has dominant wavelength (most lumens) of 620 nm but peak wavelength of 650 nm (most radiometric watts). The SPD in the data sheet ('Relative Spectral Emission') definitely is radiometric. The other line in the graph is standard luminosity function normalized to 1.
Nice spectrum (very similar to Vero 1750K) but efficiency of this LED is too low to be useful. BTW it is a phosphor converted LED.
GrowLightResearch
Well-Known Member
Thanks.
If you look on page 4 the minimum CRI column is 80
I see the CRI 90 at the bottom. Which is it?
On the LM561B Plus on page 4 the minimum CRI column is 90. SPDs are identical.
The B+ and C are almost identical. The C added more bin choices some with improved efficiency.
Thanks, good to know.
LM561B+: http://www.samsung.com/global/business/business-images/led/file/product/products/201608/Data_Sheet_LM561B_Plus_CRI90_Rev.2.0.pdf
Rocket Soul
Well-Known Member
If this discussion i going the way of high cri, heavy red phosphor leds id like to mention this:
http://www.nichia.co.jp/en/product/led_product_data.html?type='NF2L757G-F1 (Rfe00,Rff00,Rfg00,Rfh00)'
Looks like a 2700k with a red peak around 660nm. Also note that the bluepeak is closer to 440nm than 450. Did some basic calculations and got around 130lums/watt but im on my phone so it might be off.
It caught my eye because ive not really seen any spectrum look so much like mccree action spectrum. Also, having the blue peak at around 440 insted 450 (thats the standard, right?) would widen the blue peak if mixed for example a standard 3000k/80 cri. Kinda like those photon fantom wavy boards. As our sponsors are gravitating towards 3030 foot print i also thought it mentionable.
130l/w is rather shitty but as lumens are for humans, and and if i dont remember wrong LER of a 3000k /90cri usually is around 260 those 130 l/w might go long way. Posting here cause @alesh is the man for LER calculations and i hope for some input. Pretty sure this would provide a high YPPF with a non blurple spectrum. For your consideration, and sorry if off original topic but it seems to be relevant to the last posts
Edit, also a nice bit of far red. Feels like this would fill in a 80cri spectrum really well
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tomate
Well-Known Member
I did the math on one of these nichia chips. Don't know which exactly it was. Came out with 2.43 µmol/J.
Rocket Soul
Well-Known Member
Nice! If its actually this chip...
There might be manufacturing considerations working against it though, not much info on bins and voltage seems to vary a lot between typical and max. Also max mA is lower than the current samsung midpower diodes so might not be a good idea to put on the same string.
At least i feel its worth looking into for those who have the means.
Edit: cheapest wholesale price i found is .34€, not economic enough for most.
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GrowLightResearch
Well-Known Member
I was thinking the epoxy had an organic dye rather than phosphor.
The temperature curve was more like an AlGaInP than a nitride.
Usually the forward voltage is the give away. Not this one. Just more confusing
Then I looked at the Duris Amber because they typically have a horrible temperature curve. The amber curve was the same as the red.
Good catch, I'm impressed.
Now I think this is a PRS-LED (Photon Recycling Semiconductor).
There was one paragraph in the Duris amber datasheet that was not in the red datasheet which goes along with your high CRI.
Wide spectrum of phosphor converted colors with excellent color rendering and supreme efficacy in cost effective industry standard LED
@tomate I apologize for doubting it was a phosphor pumped LED. It is now looking to be a contender to mix with the LM561C. The LM561 90 CRI would be the easy solution because there are many PC Boards with the Samsung footprint.
The PRS would explain both the high forward voltage, temperature curve, and why the amber curve was the same as red.
The recycling semiconductor is AlGaInP, while the phosphor is pumped with a GaInN.
And the 440nm is the most efficient wavelength for a PRS. This is a very high efficacy red LED.
Source: Light Emitting Diodes 2nd edition, Schubert
Also from Schubert:
The above is a 470nm but it was also said:
The maximum luminous efficiency occurs if the primary source emits at the wavelength 440 nm. A theoretical luminous efficiency of 336 lm/W is obtained for this wavelength.
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GrowLightResearch
Well-Known Member
I was not sure at the time, thanks. Glad you chimed in, I though if anyone, you would know.
I thought the "SPD" is luminous, but I know better than to doubt you.
I guess if it were luminous it would be very lopsided. Too symmetrical.
The V(wavelength) means spectral luminous efficiency function
I do not know what the f(wavelength) represents. Flux? It does have the flux symbol Φ , but nothing designating radiometric like: Φe
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Just another find...they also have a cobs line ....https://www.vossloh-schwabe.com/uploads/tx_sbdownloader/LUGA-Line-COB-HB-Horti_DML12B_EN_01.pdf
alesh
Well-Known Member
I'd say that Φ is radiometric by default. Perhaps it's a German thing? Anyway, when luminous flux is used they use symbol ΦV (pages 9&10).
Graph of distribution of luminous flux would look rather shifted to 555nm with no blue peak and nothing in the far red region. The top would be at dominant wavelength (NOT peak wvl).
@tomate
Thanks alot for this:
I did ask in the forum but I think it got lost in the shuffle.
I can't seem to pm you
Thanks alot for this:
Any chance you could post or send me the script for that layout? It would be a great starting point for my project.
I did ask in the forum but I think it got lost in the shuffle.
I can't seem to pm you
GrowLightResearch
Well-Known Member
I just paid $12 for seven BXEB-L0560Z-30E2000-C-B3 at Arrow.
$5 more per strip than one month ago.
Other distributors will not have any for a month or two.
$5 more per strip than one month ago.
Other distributors will not have any for a month or two.
nfhiggs
Well-Known Member
Digikey has 1 footers in stock for 4 bucks each. I may order a few for the hell of it. I got a design idea for them.