Quantum board questions

[fragileassassin]

thats 15000, you have a multiplier of 100 on it.
my T8 4 tube florescent I have my seedlings under does around 12k at 4-5" if that helps any. They seem happy enough with it.
I feel 15k is a pretty good place for your plants right now, but your lights will use much less power if you adjust the height and power to achieve that 15k at 12-18"

 

[Hot Diggity Sog]

thats 15000, you have a multiplier of 100 on it.
my T8 4 tube florescent I have my seedlings under does around 12k at 4-5" if that helps any. They seem happy enough with it.
I feel 15k is a pretty good place for your plants right now, but your lights will use much less power if you adjust the height and power to achieve that 15k at 12-18"

Thank you kind sir!

 

[fragileassassin]

Oh i remembered where I was lol..
From what ive read you cant use a lux meter with LEDs without a conversion to get it close-ish.
You can use a meter to kind of scale it compared to what it was and make sure you have uniform lighting, but it wont give you an accurate lux reading with leds

 

[Hot Diggity Sog]

Oh i remembered where I was lol..
From what ive read you cant use a lux meter with LEDs without a conversion to get it close-ish.
You can use a meter to kind of scale it compared to what it was and make sure you have uniform lighting, but it wont give you an accurate lux reading with leds

Hmm...that is very interesting. Maybe I should just be conservative then and not push it.

 

[fragileassassin]

Hmm...that is very interesting. Maybe I should just be conservative then and not push it.

I just transferred my week old seedlings to under my 304 boards im running them nearly as low as the go at around 12". Ill check for stretching or burning in the morning (im doing 24 hr veg) and will adjust from there.
I also bought a lux meter and didnt figure out it wouldnt work until I couldnt understand why I was getting the readings I was.
There is a bunch of info about it around here, ill see if I can find anything solid.

 

[Hot Diggity Sog]

I just transferred my week old seedlings to under my 304 boards im running them nearly as low as the go at around 12". Ill check for stretching or burning in the morning (im doing 24 hr veg) and will adjust from there.
I also bought a lux meter and didnt figure out it wouldnt work until I couldnt understand why I was getting the readings I was.
There is a bunch of info about it around here, ill see if I can find anything solid.

I'm also doing 24/hr veg. I'll report back and wait for info from you too. Thanks man!

 

[fragileassassin]

I found this!
so with the conversions below we can get a fairly close estimate.
meter reading for early seedlings should be good in the 15-20k range and can push up to around 40k-45k in full veg and up to 70k in flower.
my 304 boards read 75k @ 12" at half total power (which is my max output power with how I have drivers set up) so I should be quite good if this is all right.

1000 lux = 15 μmol/s/m2
So the conversion for 3000k-3500k white LEDs is right around 67. If we want an "accurate" reading we have to convert.
67 lux = 1 micromole/s/m2
for a 15k reading in lux
15000 / 67 = 223.8 micromoles

So for cannabis, bottom threshold for optimal growth and photosynthesis is a DLI of DLI of 22 would be:
24/0 schedule: 254.6 micromoles/m2/s-1
18/6 schedule: 339.5 micromoles/m2/s-1
12/12 schedule: 509.25 micromoles/m2/s-1


For Cannabis, the Top threshold for optimal growth and photosynthesis is a DLI of 65 moles per day.
***extremely important notice, only go up to these amounts if you are using supplemental CO2, do not go this high if you are not using supplemental CO2 as you will actually slow down photosynthesis and waste energy.

24/0 schedule: 752.31 micromoles/m2/s-1
18/6 schedule: 1003.08 micromoles/m2/s-1
12/12 schedule: 1504.6 micromoles/m2/s-1


The generally accepted guidelines for artificial light PPFD in flowering are this:
in a 12/12

PPFD of at least 510 micromoles/m2/s-1 for the low end of optimal intensity
PPFD of at least 800-1100 micromoles/m2/s-1 for perfect optimal lighting without additional CO2.
PPFD of at least 800-1500 micromoles/m2/s-1 for perfect optimal lighting WITH additional CO2.

 

[Hot Diggity Sog]

I found this!
so with the conversions below we can get a fairly close estimate.
meter reading for early seedlings should be good in the 15-20k range and can push up to around 40k-45k in full veg and up to 70k in flower.
my 304 boards read 75k @ 12" at half total power (which is my max output power with how I have drivers set up) so I should be quite good if this is all right.

1000 lux = 15 μmol/s/m2
So the conversion for 3000k-3500k white LEDs is right around 67. If we want an "accurate" reading we have to convert.
67 lux = 1 micromole/s/m2
for a 15k reading in lux
15000 / 67 = 223.8 micromoles

So for cannabis, bottom threshold for optimal growth and photosynthesis is a DLI of DLI of 22 would be:
24/0 schedule: 254.6 micromoles/m2/s-1
18/6 schedule: 339.5 micromoles/m2/s-1
12/12 schedule: 509.25 micromoles/m2/s-1


For Cannabis, the Top threshold for optimal growth and photosynthesis is a DLI of 65 moles per day.
***extremely important notice, only go up to these amounts if you are using supplemental CO2, do not go this high if you are not using supplemental CO2 as you will actually slow down photosynthesis and waste energy.

24/0 schedule: 752.31 micromoles/m2/s-1
18/6 schedule: 1003.08 micromoles/m2/s-1
12/12 schedule: 1504.6 micromoles/m2/s-1


The generally accepted guidelines for artificial light PPFD in flowering are this:
in a 12/12

PPFD of at least 510 micromoles/m2/s-1 for the low end of optimal intensity
PPFD of at least 800-1100 micromoles/m2/s-1 for perfect optimal lighting without additional CO2.
PPFD of at least 800-1500 micromoles/m2/s-1 for perfect optimal lighting WITH additional CO2.

I'm off to bed but will study this in the morning. Thank you!