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Always keep my LEDs a foot or so above my plants, find when they are really close they dont grow up. Their energy seems to go into padding out what is already there. Good for canopy level bud production in the future i think. i think as close as the LEDs can go especially in vegging the more bud sites appear.
The Growing Edge Magazine - Rays of Life
This is the most interesting article I have read in a while and i think ties everything together in this thread.
Poses quite a few more questions i Feel.
My office is a 12x12 room not including my closet. Assuming all 50 of those HID lights were in the kilowatt range, yes, either vertical or horizontal orientation of the bulbs would produce way too much light, and all but cacti would likely die off.
Even 170w of LED is burning my two large plants, and they're about 8 inches away from the panel. pH is fine, nute regimen is fine, plenty of air and CO2, both the same strain/genetics. The one on the right is closer and is burned more. I guess I'm going to have to use smaller hydro buckets next time.
Does anyone know what the light compensation and saturation levels are for cannabis? It is obviously dependent on other things such as co2.Quote:
Originally Posted by mrnobody
The article did bring up my question on UV stating research is leaning towards the side that it is beneficial towards things such as development of flavors, colors, and fragrances.
In urban garden issue 9 they state that Plasma International's sulfur plasma grow light produces almost no UV.
Is UV beneficial?
Has anyone experimented with supplemental UV lights?
What kinds of lights give off UV?
I read cfl's and MH do, but I do not know how much.
What about LED's?
How about sticking a lizard light in a grow room?
The light levels differ from strain to strain. I had a white widow that couldn't stand being anywhere close to the HPS while the purple kush and original hindu skunk I had just loved it. UVB is known to be beneficial in tomatoes for production of aromatic oils so I wouldn't be surprised to see it enhancing flavors and scents in other plants, on top of being beneficial for the production of your favorite desired cannabinoid. I've used T5HO lights with UVB output to supplement the lower buds on plants, and those buds were by far more potent than the larger HPS colas above. MH gives off some, as do CFLs, but mostly they use special glass that filters out the vast majority of non-visible light. Halogen lamps put off a fair amount of UV and are not shielded, and a friend of mine too cheap to got lights had me set him up with 3 40w actual CFLs and a 250w halogen he had in his garage. He got some very sticky and dank buds, smallish, about thumb-sized, but they were uber-dank. Lizard lights would work as well.Quote:
Originally Posted by demoreal
I just got this cfl for my grow to help out.
I love all this talk about lights but I am just waiting for the thread to start of someone building an LED. I might just try and build a small one first to see how it goes. If I do I will post it.
I think I am just going to use all lights.
An LED will be my next project.
If you want help building it I'll help you out. :) Be prepared to drop semi-serious cash even for a DIY project.Quote:
Originally Posted by demoreal
My friend grew with a Uv light at the start to add some heat to his grow room but the obvious problems with UV A and B light is that it is carceogenic. Would not be a great idea to have a grow room with too much.
I am also fascinated by the fact the a Metal Halide which gives out a distinct blue spectrum is still used to successfully flower with and there is an arguement that halide is better than sodium for flowering? Why? Has anyone tried using sodium and halide together in flowering? Reading about the very bottom of the blue spectrum and past visible light has really got me thinking about my lighting and also our so called traditional knowledge.
From the reading I have been doing the light that has been lacking from our grow rooms is the light that really denotes tastes, flavour, strength and growing habits. From what I have seen of Induction ights the bud produced looks and tastes similar to outdoor grown bud. Surely that can only be a good thing especially for those growing medicinal cannabis.
I am finding cloning is much easier under LEd too? They jsut take so quickly and stay looking perky all the way through. I actually thought that i would need to supplement the LEd in my cloning station with some CFL or some more of the spectrum but apparently not. Anyone have any science why this may be so?
I clone naturally, no gel, peet pots, distilled water. bio bizz all in one soil mix.
Again that looks so obviously down to the plants genetics and where it first started its life. I am sure the Kush were high in the moutains right near the equator loving the altitude and closeness to the sun, whilst the white widow comes from genetics from India and Brazil apparently. Lower altitude, different sun. It sort of goes along with what I am trying to say about recreating nature. I am still interested in moonlight though?
Also I am interested in challenging the 12/12 as that seems somewhat artificial too. I know its what we have settled on to makes things easier and more regimented but anyone tryed anything else? Heard briedly about light deprivation and training?
Also plants like critical mass named obvously because it cant possibly yield anymore. What would they do under different lighting? How did they get it to critical mass? How are genetics like that discovered and furthered and stabilised?
Oh the questions!