I could use some advice on LED light settings in my tent.

[LighterThief227]

Hi all. Im growing a strain that stretched my limits in my 2 'x 4' x 6' tent. I have the light ( mars hydro sp3000 ) dimmed to 45% of the maximum output. Ive super cropped to keep the distance @12".
I am currently in day 24 of flower and believe that the stretch has slowed down.
Now im nor seeing tip burn or curling on the leaves even tho temps have been 79° to 85° fahrenheit.
I am guessing my light settings and know its foolish to believe things are ok. My eyes can not tell the brightness the plants are under. Does anyone have experience with LED's when the canopy is at 12" in week 4 of flower?

 

[LighterThief227]

 

[LighterThief227]

This pic is from friday before super cropping. I will get a better pic tonight.

 

[LighterThief227]

Here is a pic from today.

 

[goingrey]

Looks good to me. Leaf tip burn is usually caused by overfertilization but it seems to be very limited in your case. 12" is totally fine for a 300W light at 45% power. Pretty sure they could handle even more.

 

[xet]

Run your lights full strength from seed to harvest. Manage proper height and have fun.

 

[LighterThief227]

Looks good to me. Leaf tip burn is usually caused by overfertilization but it seems to be very limited in your case. 12" is totally fine for a 300W light at 45% power. Pretty sure they could handle even more.

Thank you for the advice. Cheers.

 

[StickyBandit]

I bought a cheap light meter to check PPFD and measured the distance for 1,000 μmol at full noise on my different lights. My better lights it's ~12" but my cheap lights only get to about 800 μmol at ~6" so I use them for the cab stage
If you do get a meter make sure it reads PPFD in μmols. Someone correct me if those are the wrong terms plz
My meter connects to my phone and uses an app

This is a rough guide but they can usually handle more if healthy
Under normal home-scale operations, cannabis typically needs a PPFD of between
100 - 300 μmol/m2/s during the seedling,
400 - 600 μmol/m2/s during vegetation, and
800 - 1,000 μmol/m2/s during flowering

https://www.amazon.com/gp/product/B09BMR1SMF/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Since you have a mars hydro sp3000, which is a well known light, you could ask someone what distance 1,000 μmol is at the center on full and use that as a reference for the bud stage

 

[Cerathule]

Give it more light or the stems will grow weak and lanky

 

[LighterThief227]

I bought a cheap light meter to check PPFD and measured the distance for 1,000 μmol at full noise on my different lights. My better lights it's ~12" but my cheap lights only get to about 800 μmol at ~6" so I use them for the cab stage
If you do get a meter make sure it reads PPFD in μmols. Someone correct me if those are the wrong terms plz
My meter connects to my phone and uses an app

This is a rough guide but they can usually handle more if healthy
Under normal home-scale operations, cannabis typically needs a PPFD of between
100 - 300 μmol/m2/s during the seedling,
400 - 600 μmol/m2/s during vegetation, and
800 - 1,000 μmol/m2/s during flowering

https://www.amazon.com/gp/product/B09BMR1SMF/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Since you have a mars hydro sp3000, which is a well known light, you could ask someone what distance 1,000 μmol is at the center on full and use that as a reference for the bud stage

Thank you very much for the knowledge.

 

[LighterThief227]

Give it more light or the stems will grow weak and lanky

Thank you. I turned em ☝

 

[troutman]

A light meter really helps. Get one when you can.

 

[Corpselover Fat]

Just download a lightmeter app for your phone. No need to buy stuff.