Almost perfect (?) shallow reef led.

[oreo54]

Came across this Yuji LED and thought I'd share.
https://www.yujiintl.com/high-power-hyperspectral-led/
Interesting for those who think IR and UV are the missing element in leds.
https://www.yujiintl.com/high-power-hyperspectral-led/
A bit "warm" (7000-7500K) but would be easy to add more blue to taste.
Wide spectrum.
Apparently recommended using 9V 400mA.

Full-spectrum coverage between 350nm – 1000nm
– Homogeneous spectral power distribution
– 5.0mm × 5.0mm package
– Enhanced optical radiation density

Spectrum:

Wonder how long they last?

Funny thing is I was just about to bug some manuf about "phosphoring" a reef centric led.
Though this one isn't exactly what I had in mind seems pretty darn functional.
Still would need a blue channel BUT most of the other "colors" could be discarded.

VERY close to daylight btw.. moreso than anything I know of.

 

[theatrus]

I feel like anything in the 800+nm bin, having two magnitudes more absorption in water, is pretty far out there to be putting power into (but as you said, shallow reef). But Yuji is interesting as they also have some very flat and very broad LEDs that stop at about 800nm in their closer matched sunlight range. What suffers is efficiency, though its not as bad as it once was.

 

[oreo54]

I feel like anything in the 800+nm bin, having two magnitudes more absorption in water, is pretty far out there to be putting power into (but as you said, shallow reef). But Yuji is interesting as they also have some very flat and very broad LEDs that stop at about 800nm in their closer matched sunlight range. What suffers is efficiency, though its not as bad as it once was.

Yes their violet based ones were not only inefficient but also short lived

 

[oreo54]

Comparison .

 

[oreo54]

I feel like anything in the 800+nm bin, having two magnitudes more absorption in water, is pretty far out there to be putting power into (but as you said, shallow reef). But Yuji is interesting as they also have some very flat and very broad LEDs that stop at about 800nm in their closer matched sunlight range. What suffers is efficiency, though its not as bad as it once was.

Thing is one of the "known unknowns" is what if any effects does IR have on corals?
Not to mention it is often used as a separator between metal halides and leds. Why not the same treatment for t5's?
I digress.
Of course along with the UV thing.
Anyways so not to "prove" anything but using those leds one can err "mitigate" the controversy to a certain degree
(yea right). There will always be the is it the right band ect. type stuff though.
Orphek adds some at 720-ish and maybe one or 2 others??


Anyways decided to play with them a bit to design a "concept light"
2 channels.
One using the yujis, the other a err "broad band" blue.
Now this blue channel was not designed to be a do all flourescent channel. There are sig. gaps in the nm range.
What is was for was to mitigate the overall "whiteness" using particular nm's that also helped to equalize the spectrum to the "benchmark" Iwasaki 6500k.
Thus the heavy cyan.
Anyways a bunch of pretty pictures that are hopefully self explanatory.
Rough estimates. Ignore any power factors. Wasn't a goal..
Chart cuts off at 750nm unfortunately. The IR after that wouldn't add to color anyways.
Earlier charts covered that.

And yea using actual photosynthetically active photons to produce IR is a bit err wasteful.
AFAICT there is no dip into the violet color here except initially on only ch1
What your eye sees though is ???
Ch2 predominant color appears to be Color: #3389FF
dimming ch1 or brighter ch2 shifts the color along the BB locus in a nice linear range along it till deep in the pure blue range (ch2 only)

If actually building this would add 430-470nm to ch2 or a separate channel.
Or better yet 2 channels one with blue to blue green. Other with violet to UV.
Not sure it helps and doubt if it hurts. The amount of red may be a bit problematic but that is supposedly what the FR is for.
Using only "white" and blue eliminates a lot of the worst disco.
Of course you always have the problem of what nm are actually available.

 

[theatrus]

Thing is one of the "known unknowns" is what if any effects does IR have on corals?
Not to mention it is often used as a separator between metal halides and leds. Why not the same treatment for t5's?
I digress.

An interesting question. I can't answer it, nor can I have a controlled experiment (time/space/skill reasons), but is worth looking at. Especially to mimic shallow/tidal environment.

Sadly there is no "buy now" for this LED.

 

[oreo54]

An interesting question. I can't answer it, nor can I have a controlled experiment (time/space/skill reasons), but is worth looking at. Especially to mimic shallow/tidal environment.

Sadly there is no "buy now" for this LED.

I did write to Yuji about pricing and availability.
I could call Calif. though. They have been helpful in the past.

3711 Long Beach Blvd #5053, Long Beach, CA 90807
562-391-9140

Yuji changes available products like socks. :)

 

[oreo54]

A bit of a followup on these hyperspectral chips.
Unfortunately at $300/50 and a projected total wattage of 18W making the cost over $16/watt the term impractical comes to mind. Oh yea if one bought 10,000's probably a lot cheaper.
Anyways a very interesting spectrum
Also out of stock but only had the 5300K version anyways.
https://store.yujiintl.com/collecti...00nm-0-4w-led-smd-2835?variant=42570612211969VERY fun spectrum

 

[oreo54]

BEST I add Yujis disclaimer..

Caution: This full-spectrum LED is designed and considered for non-visual and non-human-centric purpose, and the potential biological risk due to the spectral content of UV is reminded and emphasized here. Users should well understand the risk and take appropriate protections when applying this LED.

 

[Tavero]

A bit of a followup on these hyperspectral chips.
Unfortunately at $300/50 and a projected total wattage of 18W making the cost over $16/watt the term impractical comes to mind. Oh yea if one bought 10,000's probably a lot cheaper.
Anyways a very interesting spectrum
Also out of stock but only had the 5300K version anyways.
https://store.yujiintl.com/collecti...00nm-0-4w-led-smd-2835?variant=42570612211969VERY fun spectrum

This spectrum looks totally different than in the first post that you've post. What gives? Are these different LEDs.
I wouldn't consider them full spectrum in any way.
Also that disclaimer seems to be for legal reasons. UVA is not actually dangerous. At least not in these low amounts.

 

[oreo54]

This spectrum looks totally different than in the first post that you've post. What gives? Are these different LEDs.
I wouldn't consider them full spectrum in any way.
Also that disclaimer seems to be for legal reasons. UVA is not actually dangerous. At least not in these low amounts.

Besides from the color temp they shouldn't be that different.
One was 7500k ( first) other was 5200k.
I need to check into it a bit.
I'd consider the bottom one the more definitive one.
Like I mentioned changing socks.

 

[oreo54]

Besides from the color temp they shouldn't be that different.
One was 7500k ( first) other was 5200k.
I need to check into it a bit.
I'd consider the bottom one the more definitive one.
Like I mentioned changing socks.

From the 1st data sheet

All characteristic curves are for reference only and not guaranteed.

 

[Tavero]

From the 1st data sheet

It seems like you posted the logarithmic spectrum in your first post. This kinda changes the usability of these LEDs. We can't use them in a UV channel because they have too much green and red. And we can't use them as a single channel white led lamp because they have too much uv. They also don't make much sense in a white channel because of their price.
In my opinions there are better options for all three cases.

 

[oreo54]

We

It seems like you posted the logarithmic spectrum in your first post. This kinda changes the usability of these LEDs. We can't use them in a UV channel because they have too much green and red. And we can't use them as a single channel white led lamp because they have too much uv. They also don't make much sense in a white channel because of their price.
In my opinions there are better options for all three cases.

Well I'll agree on price.
I also will add the likely lifespan (L80) makes the price even worse.

As to "too much" UV well ask the MH people.
The spectrum (discounting the uv spike) is balanced..
As to too much green/red ect.. opinion..

I looked at using as a white channel with the ratio of 1 to 3 white:"blues"
Should be fine as to UV output.
The one chart is relative so the color is depressed like any other color chart.


The point though is that these diodes can be used in comparative studies..
Say a group of these (uv/ir) vs say 6500K bridgelux 95cri (no uv/ir)

The spectrum matches closely sunlight composition on a broad scale which was what I started with here. An LED that "earned" it's "full spectrum" label so to speak. At least in some minds.
Yes not perfect.

The rating is 26.8 Lumens/watt.
Not a lot of green/yellow per energy.
Using a 55gal tank and requiring say 220w total watts
So 55W of the special diodes.
Giving
1474 lumens is not a lot of "color" (green centric bell curve) relatively speaking.
that level of "white" can be achieved with a 1/10 of that energy.