Are all acros loving led? Are coral enduring less par from led than T5/halides?
- Thread starter Superlightman
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Which narrow spectrum?
Depends how you run them..
That is not what I meant. I am arguing that, narrow spectrum lights are more stressful at higher par levels than said par being distributed across a wider spectrum. I stated it doesn't appear to be the source of light that causes the issue. I am not stating one source better than another for high intensities, but rather the distribution of the intensity across colors.
This would be an example of what I would call poor color distribution (i.e. red sea's light). Here we can see that the light intensity rests heavily on one small wavelength range. I suspect that this, at high intensities, causes stress on the zooxanthellae's photopigments as, rather than said intensity being distributed across various wavelengths and photopigments, it is being heavily loaded at those that have greater sensitivity to this tiny spectral range.
Any different than this?That is not what I meant. I am arguing that, narrow spectrum lights are more stressful at higher par levels than said par being distributed across a wider spectrum. I stated it doesn't appear to be the source of light that causes the issue. I am not stating one source better than another for high intensities, but rather the distribution of the intensity across colors.
This would be an example of what I would call poor color distribution (i.e. red sea's light). Here we can see that the light intensity rests heavily on one small wavelength range. I suspect that this, at high intensities, causes stress on the zooxanthellae's photopigments as, rather than said intensity being distributed across various wavelengths and photopigments, it is being heavily loaded at those that have greater sensitivity to this tiny spectral range.
Look you could be right, in a sense. I don' t know. Nobody does.
Distribution ( lenses,blending ect ) seems more important than narrow spectrums.
Narrow or wide if concentrated may cause an issue.
Btw the " white" of the mh is mostly from green blue and amber output
(RGB)
5 pigments have peak absorptions at 450- ish.
There maybe some nuance that matters ..but ..
Last edited:
Nonya
Valuable Member
Coral photosynthesis is accomplished by Chlorophyll A, C2 and beta-carotene, peridinin and xanthrophylls (diadinoxanthin and diatoxanthin). If you use blue LEDs in the 450 and 475n regions, you're hitting the two maximum absorption peaks.5 pigments have peak absorptions at 450- ish.
There maybe some nuance that matters ..but ..
I always wondered about using 450nm, because chlorophyll A's peak is at about 430nm and is almost gone by 450nm.
Japanese to English...
Coral Color Management｜BlueHarbor
This is a coral color management theory created by scientifically understanding the color of coral from an optical perspective.
Dang!!!
Nonya
Valuable Member
You can't find a reference published in English?Japanese to English...
Coral Color Management｜BlueHarbor
This is a coral color management theory created by scientifically understanding the color of coral from an optical perspective.www.blueharbor.co.jp
Dang!!!
Spare time
10K Club member
Any different than this?
Look you could be right, in a sense. I don' t know. Nobody does.
Distribution ( lenses,blending ect ) seems more important than narrow spectrums.
Narrow or wide if concentrated may cause an issue.
Btw the " white" of the mh is mostly from green blue and amber output
(RGB)
5 pigments have peak absorptions at 450- ish.
There maybe some nuance that matters ..but ..
Again, you are taking the wrong message from this. My idea is based off of Dana Riddle's work and why corals people appeared to bleach corals with leds and that in Dana's study, the MH allowed for the zooxanthellae to tolerate higher par levels before photoinhibitom kicks in. My argument is that, in his study, he used a very narrow spectrum led and the metal halide. He also noted missing a certain kind of red prevents the zooxanthellae from offsetting light stress with their photosystems. If you look at plants, they also use a red/blue combo for photosynthesis to overcome physics issues (sci show has a neat video on this).
My point is that, those who have struggled to achieve similar par values with leds compared to those with t5 or metal halide setups (i.e. par at 600 or so) may be doing so because many leds or fixtures have very narrow spectrums. Again, the examples you provide are not relevant to what I am saying. I am not saying that there are not narrow t5 or mh bulbs or that there are not wide spectrum leds. I am am led fan myself and think the other two technologies are outdated. BUT, I think that, if someone wants to achieve par levels of 600, they need to achieve that with a more balanced color spectrum rather than 80% of that intensity coming from small blue (particularly in the case of leds with narrow spectrums) . I hypothesize that some mechanism of photosynthesis is stressed when light intensity is focused into a small range of wavelength vs distributed across a wider color range. One could test this by comparing the photosaturation points of the same coral (frags from the same colony and part of the colony) under the same par level but have all colors output the same par under one.
Again I'm using a lot of generalized statements without detail as I don't really have time to write a paper on this lol
Steven Garland
Valuable Member
Happy?
Well something IS amiss...
First chart is mis-labelled AFAICT
Curve is correct.. Stuff happens..
Just out of curiosity,you keep a reef tank correct ? I just always see you in the lighting forum and have never seen a tank thread.
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