DIY with Quantum Boards
- Thread starter robincnn
- Start date
Humple
Well-Known Member
So any feedback from the QB veterans on my power and placement?
pop22
Well-Known Member
Every strain reacts differently. 16" at 80 watts may work, but watch your plants close for light burn ( starts in the tips )for 3-4 days. I'm toasting some buds right now..........lol!
Humple
Well-Known Member
Will do!
HydoDan
Well-Known Member
You don't want to much praying.. It is a sign of too much light...
http://www.growweedeasy.com/cannabis-light-burn
ttystikk
Well-Known Member
He's not there yet lol
cdgmoney250
Well-Known Member
I may have to disagree a bit. I believe it's actually a sign of photosynthesis and turgidity. Plants will increase their leaf angle towards the light being absorbed for a number of reasons.
"We examined the effects of artificially altering leaf angle of the tropical tree species Acacia crassicarpa (A. Cunn. ex Benth., Fabaceae) on light interception, leaf temperature and photosynthesis in the wet and dry seasons of tropical Australia. Reducing leaf angle from the natural near-vertical angle (90 degrees ) to 67.5, 45, 22.5 and 0 degrees greatly increased light interception and leaf temperature, and decreased photosynthetic activity. Compared with the 90 degrees phyllodes, net photosynthetic rates in the horizontal phyllodes decreased by 18 and 42% by the second day of leaf angle change in the wet and dry seasons, respectively. The corresponding values for Day 7 were 46 and 66%. Leaf angle reduction also altered the diurnal pattern of photosynthesis (from two peaks to one peak) and reduced daily CO2 fixation by 23-50% by Day 2 and by 50-75% by Day 7 in the dry season. In contrast, the xanthophyll cycle pool size in the phyllodes increased with leaf angle reduction. Thus, there are at least five major advantages to maintaining high leaf angle orientation in tropical tree species. First, it reduces excessive light interception. Second, it lowers leaf temperature. Third, it protects the photosynthetic apparatus against photodamage by excessive light. Fourth, it minimizes xanthophyll cycle activity and reduces the cost for xanthophyll biosynthesis. Finally, it enhances photosynthetic activity and helps to sustain high plant productivity."
-School of Life Sciences, Northeast Normal University, Changchun 130024, China. [email protected]
Turgor pressure in plants
"Turgor pressure within cells is regulated by osmosis and also causes the cell wall to expand during growth. Along with size, rigidity of the cell is also caused by turgor pressure; a lower pressure results in a wilted cell or plant structure (i.e. leaf, stalk). One mechanism in plants that regulate turgor pressure is its semipermeable membrane, which only allows some solutes to travel in and out of the cell, which can also maintain a minimum amount of pressure. Other mechanisms include transpiration, which results in water loss and decreases turgidity in cells.[9] Turgor pressure is also a large factor for nutrient transport throughout the plant. Cells of the same organism can have differing turgor pressures throughout the organism's structure. In higher plants, turgor pressure is responsible for apical growth of things such as root tips[10] and pollen tubes.[11]
https://en.m.wikipedia.org/wiki/Turgor_pressure"
You are totally correct in that the plants will angle their leaves to relieve heat and light saturation, but that "praying" just means that all the processes are working full steam ahead with transpiration, CO2 fixation and ultimately water/nutrient uptake. Just don't let the leaf temps get too high or let the environmental VPD get out of control or you will see the exact symptoms you are talking about. Otherwise these plants are definitely capable of utilizing a lot of light.
wuzrelygud
Well-Known Member
thanks for understanding. These were out of stock for weeks so we got a surge of orders.
Reducing the time/cost to DIY a lamp was the main goal of QB project. I apologize if these are slow fulfillment times are bothering some people.
We are working hard on fulfilling order and streamlining order fulfillment.
All Components are in stock and being processed as fast as possible. orders are not pre packaged and packed to order
https://horticulturelightinggroup.com/pages/please-read-for-4-20-pre-order-sale
QB Components, Boards, Heatsinks Lead time 1-2 weeks from order date.
Given the large number of changes to orders and order status emails, looks like it will take up to 3 weeks from order date.
have a great weekend
View attachment 3965794
Hello Evil, Robin, and Stephen.
I ordered a 3000k 135w kit about a month ago and have been loving it. Now that it is time for me to flower and flip, I am in need of more light. I currently am using a 2'x4'x7' tent. Will it be possible for me to just do what @Evil-Mobo did and get a slate 3 and put another 288QB on it? I can see that only 3500k is available for the board. Will this not be possible with the 3000k board that I currently have? Would love to hear from you guys! So ready to add another board in the tent.. Thanks!!!
Evil-Mobo
Well-Known Member
I will let them confirm but I see no reason you cannot do as you state. I am beyond thrilled with this light for veg right now. The COB's were not doing a bad job by any means but the plants are growing more to my preference with this QB light in 4K.. I think a 3K/3.5K light would do well for flower. Very happy with my 3K board in one of my 3x3's.
Also I would think with just 2 boards on the slate 3 you could literally add another kit and the two drivers would not be an issue for heat.
Just my $0.02
Stephenj37826
Well-Known Member
Send an email to the website contact us. I'm sure we can help you out. Just adding another board/driver with a slate 3 will work fine.
pop22
Well-Known Member
Good reply. I was not on board with growweedeasy's post either as I've seen this response unse 23 watt CFLs and I'm certain they werewn't over powering...lol. They do have some good info there but you need to always double check things like this.
I may have to disagree a bit. I believe it's actually a sign of photosynthesis and turgidity. Plants will increase their leaf angle towards the light being absorbed for a number of reasons.
"We examined the effects of artificially altering leaf angle of the tropical tree species Acacia crassicarpa (A. Cunn. ex Benth., Fabaceae) on light interception, leaf temperature and photosynthesis in the wet and dry seasons of tropical Australia. Reducing leaf angle from the natural near-vertical angle (90 degrees ) to 67.5, 45, 22.5 and 0 degrees greatly increased light interception and leaf temperature, and decreased photosynthetic activity. Compared with the 90 degrees phyllodes, net photosynthetic rates in the horizontal phyllodes decreased by 18 and 42% by the second day of leaf angle change in the wet and dry seasons, respectively. The corresponding values for Day 7 were 46 and 66%. Leaf angle reduction also altered the diurnal pattern of photosynthesis (from two peaks to one peak) and reduced daily CO2 fixation by 23-50% by Day 2 and by 50-75% by Day 7 in the dry season. In contrast, the xanthophyll cycle pool size in the phyllodes increased with leaf angle reduction. Thus, there are at least five major advantages to maintaining high leaf angle orientation in tropical tree species. First, it reduces excessive light interception. Second, it lowers leaf temperature. Third, it protects the photosynthetic apparatus against photodamage by excessive light. Fourth, it minimizes xanthophyll cycle activity and reduces the cost for xanthophyll biosynthesis. Finally, it enhances photosynthetic activity and helps to sustain high plant productivity."
-School of Life Sciences, Northeast Normal University, Changchun 130024, China. [email protected]
Turgor pressure in plants
"Turgor pressure within cells is regulated by osmosis and also causes the cell wall to expand during growth. Along with size, rigidity of the cell is also caused by turgor pressure; a lower pressure results in a wilted cell or plant structure (i.e. leaf, stalk). One mechanism in plants that regulate turgor pressure is its semipermeable membrane, which only allows some solutes to travel in and out of the cell, which can also maintain a minimum amount of pressure. Other mechanisms include transpiration, which results in water loss and decreases turgidity in cells.[9] Turgor pressure is also a large factor for nutrient transport throughout the plant. Cells of the same organism can have differing turgor pressures throughout the organism's structure. In higher plants, turgor pressure is responsible for apical growth of things such as root tips[10] and pollen tubes.[11]
https://en.m.wikipedia.org/wiki/Turgor_pressure"
You are totally correct in that the plants will angle their leaves to relieve heat and light saturation, but that "praying" just means that all the processes are working full steam ahead with transpiration, CO2 fixation and ultimately water/nutrient uptake. Just don't let the leaf temps get too high or let the environmental VPD get out of control or you will see the exact symptoms you are talking about. Otherwise these plants are definitely capable of utilizing a lot of light.
HydoDan
Well-Known Member
I was just warning a noob about too much praying... As I experienced it..I may have to disagree a bit. I believe it's actually a sign of photosynthesis and turgidity. Plants will increase their leaf angle towards the light being absorbed for a number of reasons.
"We examined the effects of artificially altering leaf angle of the tropical tree species Acacia crassicarpa (A. Cunn. ex Benth., Fabaceae) on light interception, leaf temperature and photosynthesis in the wet and dry seasons of tropical Australia. Reducing leaf angle from the natural near-vertical angle (90 degrees ) to 67.5, 45, 22.5 and 0 degrees greatly increased light interception and leaf temperature, and decreased photosynthetic activity. Compared with the 90 degrees phyllodes, net photosynthetic rates in the horizontal phyllodes decreased by 18 and 42% by the second day of leaf angle change in the wet and dry seasons, respectively. The corresponding values for Day 7 were 46 and 66%. Leaf angle reduction also altered the diurnal pattern of photosynthesis (from two peaks to one peak) and reduced daily CO2 fixation by 23-50% by Day 2 and by 50-75% by Day 7 in the dry season. In contrast, the xanthophyll cycle pool size in the phyllodes increased with leaf angle reduction. Thus, there are at least five major advantages to maintaining high leaf angle orientation in tropical tree species. First, it reduces excessive light interception. Second, it lowers leaf temperature. Third, it protects the photosynthetic apparatus against photodamage by excessive light. Fourth, it minimizes xanthophyll cycle activity and reduces the cost for xanthophyll biosynthesis. Finally, it enhances photosynthetic activity and helps to sustain high plant productivity."
-School of Life Sciences, Northeast Normal University, Changchun 130024, China. [email protected]
Turgor pressure in plants
"Turgor pressure within cells is regulated by osmosis and also causes the cell wall to expand during growth. Along with size, rigidity of the cell is also caused by turgor pressure; a lower pressure results in a wilted cell or plant structure (i.e. leaf, stalk). One mechanism in plants that regulate turgor pressure is its semipermeable membrane, which only allows some solutes to travel in and out of the cell, which can also maintain a minimum amount of pressure. Other mechanisms include transpiration, which results in water loss and decreases turgidity in cells.[9] Turgor pressure is also a large factor for nutrient transport throughout the plant. Cells of the same organism can have differing turgor pressures throughout the organism's structure. In higher plants, turgor pressure is responsible for apical growth of things such as root tips[10] and pollen tubes.[11]
https://en.m.wikipedia.org/wiki/Turgor_pressure"
You are totally correct in that the plants will angle their leaves to relieve heat and light saturation, but that "praying" just means that all the processes are working full steam ahead with transpiration, CO2 fixation and ultimately water/nutrient uptake. Just don't let the leaf temps get too high or let the environmental VPD get out of control or you will see the exact symptoms you are talking about. Otherwise these plants are definitely capable of utilizing a lot of light.
GardenGuy
Well-Known Member
decreased the wattage a little bit @80w same height @13-14in and they might seem a bit more relaxed but still happy. thanx guys. it's tough beign a noob in heavy summer with a fixture i don't know how to operate correctly. anyway my plants are fine besides a little lightburn. clones survived though.
thanx for the info!
thanx for the info!
Last edited:
You should look for tacoing/curling in of the leave edges (although this can also be a symptom of low RH (very high VPD). They will curl in to expose less leave surface to the light.
In flower look for bleaching bud tips and leave curling.
cdgmoney250
Well-Known Member
For sure man, too much light without proper conditions, or too hot of a canopy can definitely stress plants praying plants.
BobCajun
Well-Known Member
Yeah but praying doesn't necessarily indicate excessive light. I've read that far red causes that too. If it's LEDs with no FR then it couldn't be that though. It seems to me that they're trying to get MORE light by doing that. Maybe it let's more light get down to the lower areas too. That could be part of why it evolved.
The article about the tree leaves is a different plant, which may be less tolerant of bright light. I can see how you made the deduction that it might also be why cannabis does it, but it has yet to be confirmed scientifically. To me it looks like they love the light and want to get even closer to it. Not trying to say you're wrong, just that your theory can't be stated as fact, yet.
The article about the tree leaves is a different plant, which may be less tolerant of bright light. I can see how you made the deduction that it might also be why cannabis does it, but it has yet to be confirmed scientifically. To me it looks like they love the light and want to get even closer to it. Not trying to say you're wrong, just that your theory can't be stated as fact, yet.