LED Flood Lights

[Nexogen]

The question of a member of this site: "I'm going to use LED Flood Lights for additional lighting during the winter. Does it make any difference if the flood light is 3000K or 5000K?" caused anger.

I do not resign myself and I want to clarify why light is important in a plant's life.

- Plants get energy from light through a process called photosynthesis. This is how light affects the growth of a plant. Without light, the plant would not be able to produce the energy it needs to grow. Any photons within 400-700 nm that are absorbed by the plant will contribute to photosynthesis. However, not all wavelengths are absorbed equally.
- Light intensity for growth plays the most important role in photosynthesis. However, it is light colour that plays the most important role in photomorphogenesis. Photomorphogenesis refers to light-mediated development where plant growth is altered in response to light signals. Photomorphogenesis only describes how plant growth patterns respond to light spectrum, which is a separate process from photosynthesis where light is used as a source of energy. Photomorphogenesis is directly affected by three factors: light quality, light intensity, and photoperiod.

[Nexogen]

When you buy an LED light source you know for sure how you use it; as an extra light (to supplement the light from the outside) or as a single light source (meaning you have nothing outside).
If you buy a fertilizer you want to know what content it has (N, P, K, Ca, S, Mg etc ...), so you should also be interested in the kind of LED you buy. Depending on the Kelvin (color temperature), the plant will react differently (Photomorphogenesis).
I think the additional LED light does not really matter K, the luminous intensity is important .
The more difficult part is when you use LED light as the only light source.
In this case, K begins to be important and photomorphogenesis begins to influence its physical form.

[Ray]

Originally Posted by Nexogen

When you buy an LED light source you know for sure how you use it; as an extra light (to supplement the light from the outside) or as a single light source (meaning you have nothing outside).
If you buy a fertilizer you want to know what content it has (N, P, K, Ca, S, Mg etc ...), so you should also be interested in the kind of LED you buy. Depending on the Kelvin (color temperature), the plant will react differently (Photomorphogenesis).
I think the additional LED light does not really matter K, the luminous intensity is important .
The more difficult part is when you use LED light as the only light source.
In this case, K begins to be important and photomorphogenesis begins to influence its physical form.

While I understand where you're going with these comments, and agree in principle, there are two things that give me pause at accepting them, as is.

First, we must realize that two LED lamps with the same CCT may not have the same spectrum. (Read this.)

If we accept that different spectra result in different growth patterns, then that would suggest that two lamps with the same CCT could give differing growth.

The second is that I have never seen a definitive study that proved that different CCT's within the typical range available LED or fluorescent lamps result in different growth patterns. If you have though, I'd love to see it.

This falls into the same realm as PAR, or PPF. Folks tell you that a plant needs "so many" µmol/m^2/day, but as it's possible that they can get that many all at 400nm or at 700 nm or anywhere in between (and NOBODY is going to challenge photomorphogenesis variation at those extremes), how does that help?

[Nexogen]

I totally agree with you, two white LEDs manufactured by different manufacturers or even the same manufacturer but with different CRI with the same CCT do not have the same spectrum. In the example I gave him before the scandal (the spectrum figure) was an orientative (I do not know anything that is in that LED flood). There is a lot to say I just wanted to open a civilized discussion. I also have a lot of questions about the influence of light on plants (even in the scientific world there is a lot of fog).
I went on the idea that those who intervened in this discussion know what a white LED is (here I am not referring to you).

[WaterWitchin]

Originally Posted by Nexogen

The question of a member of this site: "I'm going to use LED Flood Lights for additional lighting during the winter. Does it make any difference if the flood light is 3000K or 5000K?" caused anger.

I believe, Nexogen, you're speaking of me. You didn't cause "anger." You caused annoyance, to which I finally responded after many threads of the same.

Hold please, not done.

---------- Post added at 04:06 PM ---------- Previous post was at 03:53 PM ----------

Originally Posted by Nexogen

...In the example I gave him before the scandal ....
I went on the idea that those who intervened in this discussion know what a white LED is (here I am not referring to you).

And there was no "scandal" except perhaps in your own mind. I beg to differ on the use of the word "scandal." Do you own a dictionary? I know absolutely nothing about Kelvins and Lumens. I do know what photosynthesis is, but not how to put it in big terms. Just the general principal, which is good enough for me. I do know the difference between a white LED, a yellow LED, and a blue LED. No colorblind here!! I also know how to choose my words wisely.

And for the "those who intervened in this discussion"... you're right, I did attempt an intervention. Then I apologized for getting in where my nose shouldn't have been in the first place. And Ray graciously accepted my apology, which I appreciate.

Now I see I'm angry, scandalous, and intervening three days later. Quite interesting. Okay, carry on. I'm positive Ray can match wits with ya on many scientific levels. My intervention here is again done for now. Continue... and attempt to keep it on subject instead of insulting others.

[Nexogen]

You got the wrong adress. Here I was talking to Ray.

[Dollythehun]

Nexogen, this post started out with a simple question by the OP. While my Masters degree is not in electronics, I don't need it to know that you need to move this "discussion" to the advanced forum. I'm going to ask to have this thread closed in the interest of civility.

[WaterWitchin]

Amen.

[Nexogen]

I had the purpose (with arguments) to try to say what I think about the question asked; the difference between 3000K and 5000 in the case of led flood light. "estacio seca" said some inaccuracies and I briefly explained the idea. Who is not interested or feels insulted I ask him to avoid this thread. I also have a lot of unknowns, so I wanted to develop the subject, maybe I can understand better. My intention was not to insult anyone. Sorry.

[wisdomseeker]

Originally Posted by Setter

I'm going to use LED Flood Lights for supplemental lighting during the winter. Does it make any difference if the flood light is 3000K or 5000K?

The OP's original post has two key sentences with some very key words: "supplemental lighting during the winter" and "does it make any difference if the flood light is 3000K or 5000K".

Originally Posted by Setter

Thanks to everyone for their answers. It is really appreciated.

Post #12 - after 5 opinions (replies of varying degrees), the OP thanked everyone for their answers.

Originally Posted by Subrosa

5000K is closer to natural sunlight and provide a better appearance imo, and all other things being equal would be my choice. Either will grow plants.

By no means is this a "flex of muscles" nor am I trying to fan the flames ~ it's just another opinion/reply ~ I think the above reply was one of the better answers to the OP's question.

For what it is worth... I believe the goal of artificial 'plant' lighting is more or less just trying to mimic natural sunlight (the best as humanly possible). The majority of my 'plant' lighting is strictly artificial lighting, so I tend to dive deep into the technical aspects of artificial lighting (to provide lighting that is not only suitable for me in terms of quality & budget, but more importantly, favorable for my plants).

I for one do "accept" and "know" that different light spectra results in different growth patterns. This did not happen overnight... many-many years of experimentation/personal observation/documentation/pictures [e.g., influences on vegative growth & flowering, elongated growth, compact growth, triggering long/short term stress effects, blue light & stomas... the more blue light the wider plants open their stomas, accelerating their metabolism, etc.].

I guess we all know that 'ole' saying: opinions are like a certain body part, everyone has one. So here's another opinion... many times pissing contests on forums are caused by the big "E", but...