Will my plants grow taller if i lower my lights settings?

Ckline

Hello, i have two main questions, if i lower my led plant light settings, will my plant’s grow taller and if so then will they start to grow slower?
I have a 75gal. With a 24inch fluval 3.0 plant light covering half and the settings being set to manual, pink 65%, blue 6%, cold, pure and warm white are all 70%, also being on for 11.5 hours. I feed liquid aquarium coop easy green every week and use seachem flourish tabs every now and then.


Before I upgraded to a fluval 3.0, i had a cheap beamworks plant led light off amazon that had a lower light intensity but still a good spectrum and caused my crypts to grow a tall forest. Now they’ve melted back and don’t grow very tall but still look good and grow runners. Same thing with the jungle vallisnera, it just started to take off in my tank after a year of trying and is growing runners, but the plants dont grow very tall as I’ve seen in other aquariums.

Can i achieve taller plant growth if i lower the light intensity? Causing the plants to “reach” for more light. But then would this cause the plants to grow at a slower pace receiving less light?
Let me know what y’all think, thanks!
 

GlennO

I'm not sure but I think that would only work with demanding high light plants but even then they would soon start to look straggly and unhealthy. Low light plants are likely to grow in a similar form since they are still getting sufficient light, but a bit slower. I guess you could try it. You would also have to reduce fertilising or algae might take advantage of the excess nutrients. It's a huge bonus to have a tank without algae issues and my own approach is to leave things alone once I've found that balance which can be difficult to achieve.
 
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Ckline

I'm not sure but I think that would only work with demanding high light plants but even then they would soon start to look straggly and unhealthy. Low light plants are likely to grow in a similar form since they are still getting sufficient light, but a bit slower. I guess you could try it. You would also have to reduce fertilising or algae might take advantage of the excess nutrients. It's a huge bonus to have a tank without algae issues and my own approach is to leave things alone once I've found that balance which can be difficult to achieve.
Thank you that’s pretty understandable. Just had me thinking, i have a friend in my town with the same water source, same tank size, but we have different lighting and after observing his tank, I noticed mine is a lot more brighter than his. He has the fluval 2.0 and his tank is much dimmer but it’s completely taken over in jungle val and crypts that he never has to do gravel vac cleans but still continue to feed easy green and root tabs. If i could achieve the same by making it dimmer
 
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GlennO

Has he had the plants for the same amount of time? Same substrate? Neither val or crypts need high light so you could probably reduce your light level but I don't see how that would make them grow faster or taller.
 
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Ckline

Has he had the plants for the same amount of time? Same substrate? Neither val or crypts need high light so you could probably reduce your light level but I don't see how that would make them grow faster or taller.
He’s had the same plants established way longer than me, almost the same substrate, i have a black sand mixed into my eco complete while he just has eco complete. I’ve been trying to grow vall in my 75 for about almost 2 years and its now getting established and taking off with runners. In a similar post of mine i mention how the vallisneria does better in my other smaller tanks, with cheaper led lights and sand/pebble substrate. Grows at a much faster rate than the val in my 75
 
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Jerome O'Neil

we have different lighting

I think that is significant. Plant growth is stimulated by the ultraviolet end. The infrared end spurs flowering. I have programmable LEDs and I always fade out the light with a long blue period. My plants get a lot of natural light, too, but they really do will with the lighting.
 
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Ckline

I think that is significant. Plant growth is stimulated by the ultraviolet end. The infrared end spurs flowering. I have programmable LEDs and I always fade out the light with a long blue period. My plants get a lot of natural light, too, but they really do will with the lighting.
Interesting, I’ll have to look into it more
 
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