Any Repercussions to Turning Green Light Up?

[AbnormalReefer]

Hi all, my current settings for my AI Hydra 26 HDs from 4-10 PM are as follows:

UV - 118
Violet - 118
Royal Blue - 140
Blue - 116
Green - 209 (not a typo)
Red - 10
Cool White - 0

There is also a phase from 8-3 PM which includes
a higher peak in the red and a barely turned on green; however, this is not the topic of the thread.

I am aware that photosynthesis peaks in the 380nm to around 490nm range, before drastically lowering around the 520nm (green) range and heightening a little again around the 630nm range.

In short, my green is blasted to the max at late afternoon - late night. Since green is not very active photosynthetically, can I correctly hypothesize that it doesn’t harm corals, it just doesn’t do much for growth? Or is it actually harmful for coral growth to have the green blasted so high?

My reason for the greens so high is that it helps brighten the tank without changing the overall blue color scheme at night. One thing I dislike under pure blue/violet lights at night is that you can’t see the fish and their colors! With the green however, this effect is much less.

So in conclusion.... is green light harmful to corals in large amounts? Or does it just not do much for coral growth?

 

[Brad Miller]

My understanding of green led is that it is neither harmful or beneficial in any significant way, maybe this bump will help others see this and chime in.

 

[Daniel Waters]

Hi all, my current settings for my AI Hydra 26 HDs from 4-10 PM are as follows:

UV - 118
Violet - 118
Royal Blue - 140
Blue - 116
Green - 209 (not a typo)
Red - 10
Cool White - 0

There is also a phase from 8-3 PM which includes
a higher peak in the red and a barely turned on green; however, this is not the topic of the thread.

I am aware that photosynthesis peaks in the 380nm to around 490nm range, before drastically lowering around the 520nm (green) range and heightening a little again around the 630nm range.

In short, my green is blasted to the max at late afternoon - late night. Since green is not very active photosynthetically, can I correctly hypothesize that it doesn’t harm corals, it just doesn’t do much for growth? Or is it actually harmful for coral growth to have the green blasted so high?

My reason for the greens so high is that it helps brighten the tank without changing the overall blue color scheme at night. One thing I dislike under pure blue/violet lights at night is that you can’t see the fish and their colors! With the green however, this effect is much less.

So in conclusion.... is green light harmful to corals in large amounts? Or does it just not do much for coral growth?

In your specific situation, I doubt any adjustments to the green channel will have much impact. There are only 2 individual green LEDs in a hydra 26, so not a significant amount relative to other channels. And, don't forget your white LEDs will cover the green spectrum also.

In general, I think LED manufacturers like adding in individual green LEDs more to allow us to tweak the color of the light (since the human eye is sensitive to green) than any great need by the corals for that nm range. Of course, that doesn't mean that there isn't some upper limit to what you could blast a coral with, but you're not going to come near approaching that from altering the green LEDs on lights nowadays (whites are another issue but that is usually a result of too much overall par and not necessarily too much exposure to the green spectrum).