Colours of corals

[oreo54]

This is interesting because some years ago I try to import a similar T5 from the US. It was just the 720 peak I was interested of (back to the discussion about emerson effect) I got the tubes but but in a thousand pieces. Has anyone test these tubes?


Interesting - I know that some LED does that - Somewhere in my memory say that at least the early Kessils was constructed that way - but i do nor know where it is coming from.


Sincerely Lasse

Actually.. sort of.
https://aquanerd.com/2015/07/ati-giesemann-t5-comparison-part-1.htmlSee pt 2
https://aquanerd.com/2015/07/ati-giesemann-t5-comparison-part-2.htmlDoesn't show the pronounced spike at 700nm though.
Final part.
https://aquanerd.com/2015/08/ati-giesemann-t5-comparison-part-3.html

Another "oddball" yet realistic color.

Korallen-Zucht T5 Bulb "Great Barrier Turquoise"​

https://www.reef2reef.com/threads/korallen-zucht-t5-bulb-great-barrier-turquoise.967217/

Giesemann Aquablue Azure​

https://www.reef2reef.com/threads/giesemann-aquablue-azure.752994/

 

[oreo54]

I ordered some turquoise T5 bulbs from Germany. They are called Great Barrier Turquoise.


This is the spectrum:

Funny.. was writing about it at the same time you posted.

 

[areefer01]

Interesting - I know that some LED does that - Somewhere in my memory say that at least the early Kessils was constructed that way - but i do nor know where it is coming from.

Kessil's array for the a360x had Green and Violet. Maybe it was violet and indigo.

 

[oreo54]

Interesting - I know that some LED does that - Somewhere in my memory say that at least the early Kessils was constructed that way - but i do nor know where it is coming from.


Sincerely Lasse

I would be surprised if Kessil did this.Kessil did use (one of the first I believe)a seperate UV diode in their dense matrix arrays.
The companies that spiked violet emitters with RGB phosphors that I know of are:
SORRA
Kyocera
Seoul Semiconductor Sunlike series.
Yuji.
Waveform (rebrand?) and probably a few others.

Of course a host of aqarium lights added individual violets.
Lumileds even added some to their COB's in the Crisp Color line.
Whole purpose was to punch up the brighteners put in thing like clothing that were stimulated with violet/UV.


There were(are?) issues though. Violets (400nm-ish) were less efficient than your cheap and mass produced royal blue leds.
The 5400k (no longer made) SORRA's (stripped the cob out) I ran over fw would heat up a heatsink to a higher temp than most "normal" cobs run at the same mA's.
Part of it may be due to the fact the cob seemed to be mounted on a more pure aluminum base. 100% aluminum is a better conductor than any of the alloys.
Indirect judgement of efficiency. More heat, less photons.
They also had shorter lifespans
Last the blue phosphor wasn't as stable as the red and green phosphor in that high of an intensity package.
Much hotter environment than say a t5 I guess.
Supposedly the blue issue was solved, lifespans are getting better and efficiency is higher BUT probably not at the same level as the blue leds.

 

[Lasse]

If I remember right - this was the one I try to buy - from here. Wave point.

Sincerely Lasse

 

[oreo54]

If I remember right - this was the one I try to buy - from here. Wave point.

Sincerely Lasse

Too bad it was broke. Would have been interesting.
Of course it is fairly easy to build in LEDs nowadays.
Rough approximation.
Or just the 740nm ones

 

[chema]

Hi Lasse: congratulations for a simple but very informative experiment. I'm curious about the the power you run the violet lights in the Mitras light bar. I have three Mitras LS 7206 over my tank and I have been running the 385 and 420 nm LED at 100% power for the last months. I have experienced problemas with some of my SPS and I begin to think that the 385 nm LED may have something to do with it.

 

[Lasse]

Mitras Bar 2 has 425 nm as the lowest wavelength

My basic settings

I run seasonal lights too

And the bars is max at 90 % output. So for the moment - around 87 % intensity as highest point. But I am in an experimental phase according to light for the moment.

Yes - I would test with turning down the 385 nm - maybe set it low and rise 5 % a week. This is a rather good write up

Sincerely Lasse

 

[chema]

Mitras Bar 2 has 425 nm as the lowest wavelength

My basic settings

I run seasonal lights too

And the bars is max at 90 % output. So for the moment - around 87 % intensity as highest point. But I am in an experimental phase according to light for the moment.

Yes - I would test with turning down the 385 nm - maybe set it low and rise 5 % a week. This is a rather good write up

Sincerely Lasse

Thank you Lasse. A very interesting reading on the relationship between the fluorescent proteins and incident wavelenght. I have to think further on it and may be modify a little the output.
Also, I liked your parabolic output. Right now I just have a ramp from zero to 100% in 1 h, full intensity for 12 hours (blue) and 9 h (rest) and then the ramp down from 100% to 0 in 1 h. Do you use light composer or do you manually adjust the individual LEDs outputs?

 

[Lasse]

I use this model as a base.

This light schedule is new - I started yesterday. I use all channels (not 4500 K) with the same intensity. I had a schedule like you describe but was not pleased with it - there was a clear stagnation (oversaturated ?) in the end. I have 16:00 as my noon. I have one row of 4500 K. I will use that as my moonlight. I have put in a rainy day for my white (6 500 and 8 000 K)

I did not use the composer in this case but you can do that if you want. Here is my figures

Sincerely Lasse

 

[chema]

Thank you Lasse. I'll love to hear how corals respond to that light scheme

 

[Lasse]

I will report in my build thread

Sincerely Lasse