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Container Grown Banana Plants This forum is for discussions about growing banana plants in containers.


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Old 09-27-2013, 01:53 AM   #41 (permalink)
 
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Default Re: LED Grow Light

You can check out LED Grow Lights | Apollo LED Grow Panels | UFO Grow Lights
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Old 02-16-2014, 02:49 PM   #42 (permalink)
 
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Default Re: LED Grow Light

Generally, I've heard that blue (>6000K or metal halide) light is best for vegetative growth, and red (<3000K or high pressure sodium) light is best for flowering/fruiting. LED's usually have blue and/or red lights. Reading Amazon reviews, it seems like you get what you pay for. Some are less that $30, but the reviews say that they're completely worthless, while some are over $1000, but the reviews are phenomenal. I've talked a lot about this with the owner of my local hydroponics store (Home). He said he bought a Kessil, but after testing it under a light meter, decided not to sell it. He said that some brands he tested put out lots of Photosynthetically Active Radiation (PAR) at one specific distance, but much less at other distances. Others were more stable across different distances. In practical terms, this means that the top of your plant might do really well, but the rest of it won't, unless you get an LED whose PAR remains stable across distances. PAR is really what plants use. Lumens are just what humans see. More lumens usually means more PAR, but not always.
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Old 03-13-2018, 10:49 AM   #43 (permalink)
 
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Default Re: LED Grow Light

Quote:
Originally Posted by sunfish View Post
What color spectrum should prevail?
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Old 04-14-2018, 06:41 PM   #44 (permalink)
 
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Default Re: LED Grow Light

It depends on what stage of growth your plants are in. More blue for veg; more red for flowering.
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Old 04-15-2018, 06:17 AM   #45 (permalink)
 
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Default Re: LED Grow Light

just thought i would put this here as i watched it only a couple days ago

finally heard a good review although i have not seen a good led set up in person i have heard of real results... very specific units only.. dont know the brand/model sorry
until i see more proof my opinion of them is the same as some of the first replies

https://www.youtube.com/watch?v=mOQ2SmaDLOY


UVLAN is an issue no matter the source i guess
i do have a bit of light leakage and i sleep next to the plants

Livermore's Centennial Light Bulb

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Old 04-15-2018, 11:17 AM   #46 (permalink)
 
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Default Re: LED Grow Light



https://www.youtube.com/watch?v=ifGdAcDryXk


Good scientists and engineers have terse speaking and writing skills because those skills are needed to author papers in peer reviewed journals where publication space is in high demand and low supply.
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Old 04-15-2018, 12:02 PM   #47 (permalink)
 
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Default Re: LED Grow Light

The main health concern about LED household lighting is that too much blue interferes with people's circadian rhythm. Some manufacturers have addressed this by replacing some of the blue and red wavelengths with violet wavelengths near 400nm. I consider this a sales gimmick like "made with sea salt" and "gluten free." Plants prefer red (660nm) and blue (450nm) to violet (400nm) therefore the "healthy" bulbs are not so good for plants.

http://www.ledsmagazine.com/articles...-lighting.html
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Old 04-17-2018, 05:24 AM   #48 (permalink)
 
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Default Re: LED Grow Light

Quote:
Originally Posted by aruzinsky View Post
The main health concern about LED household lighting is that too much blue interferes with people's circadian rhythm. Some manufacturers have addressed this by replacing some of the blue and red wavelengths with violet wavelengths near 400nm. I consider this a sales gimmick like "made with sea salt" and "gluten free." Plants prefer red (660nm) and blue (450nm) to violet (400nm) therefore the "healthy" bulbs are not so good for plants.

http://www.ledsmagazine.com/articles...-lighting.html
I use software on my computer to gradually change the color temperature on my screen for this reason. https://justgetflux.com/

I grow in the vegetative phase with 4000K lights which are pretty neutral (I also have some 2700K lights). But I make sure they're off at 7pm. And I agree with you, the problem with violet at 400nm is that's where chlorophyll absorption rates start to drop off.
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Old 04-17-2018, 10:26 AM   #49 (permalink)
 
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Originally Posted by speakeasy View Post
I use software on my computer to gradually change the color temperature on my screen for this reason. https://justgetflux.com/

I grow in the vegetative phase with 4000K lights which are pretty neutral (I also have some 2700K lights). But I make sure they're off at 7pm. And I agree with you, the problem with violet at 400nm is that's where chlorophyll absorption rates start to drop off.
The backlighting in LCD monitors and TVs (and, maybe, smartphones?) is currently the same as the light emitted from typical household lighting bulbs, either fluorescent or LED. Possibly, the manufacturers of those monitors will switch to the violet rich LED lighting and then you can keep the color temperature on your screen high.

I aesthetically prefer 8000K household lighting and use Sylvania Sky White fluorescent, when I can. Blue is my favorite color.

https://www.youtube.com/watch?v=gKrlRCH_M00


Another reason that I like Sylvania Sky White is that they emit no yellow wavelengths near 590nm, which improves the appearance of Caucasian skin by deaccentuating yellow blotches. Maybe, that explains the popularity of GE Reveal Incandescent bulbs which also emit no light near 590nm.

There is some evidence that wavelengths near 590nm are bad for plants.

https://www.ncbi.nlm.nih.gov/pubmed/16660793

https://jxb.oxfordjournals.org/conte.../3099.full.pdf

In this paper, all light between 500 nm and 600 nm, is called "green" and some of the bad effects attributed to "green" are actually attributable to yellow near 590nm. Note:

"Dougher and Bugbee (2001). The study compared the growth of lettuce (Lactuca sativa) seedlings under metal halide and high pressure sodium lamps. When conditions were compared, appreciable differences in dry mass, leaf area, and chlorophyll content were noted. However, the light conditions were identical in terms of calculated phytochrome photoequilibrium, blue light, red light, far-red light, and relative ratios between them. The only difference was a significant component between 580600 nm. The authors conclude that this band of wavelengths generates negative effects on plant growth, in agreement with the green light data presented in Went (1957) and Klein et al. (1965). These reports present a common theme of a negative role for 500600 nm light in plant growth."

Last edited by aruzinsky : 04-17-2018 at 10:28 AM.
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Old 06-21-2018, 03:45 AM   #50 (permalink)
 
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Default Re: LED Grow Light

Quote:
Originally Posted by Moffaka View Post
What color spectrum should prevail for grow?
Red for flowering.
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Old 06-24-2018, 05:21 PM   #51 (permalink)
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Default Re: LED Grow Light

I had stopped by the hydro store.
I picked up some pearlite and some other stuff.

A nice variable 6x6 setup retail was 1600.00 out the door.
I was impressed with the knowledge of the store personnel.
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