Or_Gro and the epic smackdown

[Or_Gro]

LOL we gonna get banned before we get started here

For what?

[Frank Cannon]

I was having a lille ole chuckle about avatar size....

[Or_Gro]

I was having a lille ole chuckle about avatar size....

6kb too big for yours?

[Or_Gro]

Day 13: Tolerating the increased ec and ppfd...

Now, just get those stragglers to enlarge (and my ass in gear, prepping their new homes)....they all have branching roots, so they should pop soon...

[Prawn Connery]

High Light (Red) at 2.5A
400-499nm = 11.4%
500-599nm = 36.8%
600-699nm = 46.3%
700-799nm = 5.1%

0.4% = >799nm

[Or_Gro]

Screen Shot 2019-05-07 at 15.33.47.png
High Light (Red) at 2.5A
400-499nm = 11.4%
500-599nm = 36.8%
600-699nm = 46.3%
700-799nm = 5.1%

0.4% = >799nm

Thanks....eyeballing it, looked like 50-60%

[Randomblame]

1st paragraph answers my question sbout red & green curves: basically 2 diff bds (plus the supplementation on one).

My other question was: Can you calculate the area under the curve from 600 up vs 599 down?

Tekniks test data show % of blue(400-499nm), green(500-599}, red (600-699)and far-red{+700nm). You could use these % values to calculate those numbers. But your spectrometer should be able to measure it exactly.
You can also calculate it from the SPD. @Alesh(rui) has made a good how-to .. But for what when you have a meter..

Maybe you could drop by and show me how to do it on my spec.

Can’t remember seeing tekniks %s....

The old school way is to lay a grid over the spectrum and count the squares...just too lazy to do it.

Yeah, it's a sisyphus job..

[unkle_psycho]

This is something that needs to be worked out I guess, I am sure there is a range of too little or too much that needs to be worked out, also spread needs to be worked out.
Or_Gro with his meters will be able to determine what is working best over a few grows.
I should also be able to provide some input regarding this with my meter once I have a UVB module set up.
10Watts of UVB should be plenty to cover a 4X4, maybe one module powered at 1W each per square foot should do it from what I have read.

What the dude in the SETI video was saying was that to activate the stress pathway with 285nm you could use 10% of the power needed for 310nm. He was claiming 375nm was practically useless.
I think the actual numbers were 0.1mW per cm2 with 285nm, and 1mW per cm2 with 310nm. 4h daily dose.

Randomblame was suggesting there is more involved, then simply activating a pathway, with benefits increasing aside dose.

[Prawn Connery]

285nm is borderline UVC (<280nm) so you only want to expose your plants to a small amount of it - it can do a lot of damage to cell DNA. Plus there are other ways to create stress responses in plants, including longer doses of mid- and far-UVB and UVA radiation. I wouldn't say 375nm is useless - better to have it than not, and you can run it longer than four hours.

[Randomblame]

This is something that needs to be worked out I guess, I am sure there is a range of too little or too much that needs to be worked out, also spread needs to be worked out.
Or_Gro with his meters will be able to determine what is working best over a few grows.
I should also be able to provide some input regarding this with my meter once I have a UVB module set up.
10Watts of UVB should be plenty to cover a 4X4, maybe one module powered at 1W each per square foot should do it from what I have read.

What the dude in the SETI video was saying was that to activate the stress pathway with 285nm you could use 10% of the power needed for 310nm. He was claiming 375nm was practically useless.
I think the actual numbers were 0.1mW per cm2 with 285nm, and 1mW per cm2 with 310nm. 4h daily dose.

Randomblame was suggesting there is more involved, then simply activating a pathway, with benefits increasing aside dose.

Yeah, its important to not use just 285nm without UVA. In nature UVA is always much more like UVB and if you use more UVB like UVA the damaging effect is much higher.
Even if you look at the Solacure flowerpower spectrum you see only a few % is below 295nm. To create an LED light with its peak at 285nm is pretty easy but to get one that cuts off at 285nm exactly you need to add an additional filter.
A 290 or 295nm diode would have more than enough light in the 285nm range but you could be sure there is no UVC.

285nm is a really dangerous wavelength for plants cuz even in 4000m height there is no light below 290nm and its much easier to make mistakes with with such low wavelength. Imagine the timer gets a defect and does not switch off. With a 295/365nm combo a whole day is probably not a big issue but with a 285/365nm combo you would kill your plants within the same time.

I've a few Agromax pureUV bulbs (75/25% UVB/A) and have tried to use them at my prefered hanging height which is 12-20" but it was simply impossible to not damage the plants. I've even built something I have used as "super-spreader" to reduce the hotspot directly under that bulbs and throw the light back into the reflector to distribute it more evenly but it has not helped enough. Only 2h splitted into 4 treatments with 18-20" was enough to hit my girls so hard that they have immediately stopped growing. ...and they don't have recovered.
The only improvement was an exceptional dense trichome layer but I've lost 30% yield or so.
Leaves of the upper two nodes were rolled up like cigars an looked like zeppelins and the green has changed to an ugly olive. Within a few days this leaves became downright hard and brittle. As if all water has disappeared somehow. They were as hard as glass and they broke like that.
Since then I'm back to the good old reptile bulbs. Yeah, you can safe a lot of energy using Agromax/Solacure bulbs but there is no way to use them with less than 2ft distance and even then you have to be very, very careful. The only way I see is to make them dimmable, either with a dimmable ballast or using a variac and dimm the transformers/ballasts input.

10-14% reptile bulbs need to run 5x longer to cause the same effect which means 4x the energy is wasted but because these bulbs mimic the natural sun spectrum they can not harm the plants in the same way.

Even Solacure developes a T5 bulb currently which has only ~40% of the flowerpower spectrum(with UVB down to 285nm) combined with 60% visible light. One could say, its like a reptile bulb but with a tiny bit true 285nm light. As soon as they are available I'll try to get them because to me it sounds really promising.
2,5h would have the same effect like 1h of the T12 bulb so its a good compromise.