Progrow 180 - Grow Box - Possible LED Burn. Help!

Hi all, long time no see!

Just in the middle of setting up my new led grow box. The plan: to make a very small compact unit that could easily be modified. My setup uses storage boxes that can be stacked - if i run out of head room i just add another box!

The environment is controlled be by two 12v temperature thermostats - one controls a 12v pc fan, the other a 12 heater. Uber simple uber cheap!

The boxes can hold 84lt, I'm currently using two stacked: 1.4ft by 2.25ft by 2.5 ft cubic feet: 7.875. The inside of the boxes have been sprayed white.

The led is from prow grow, the PG180. Kicks out 160w and has a switch mode between veg and bloom.

Find attached a few photos!

All looks grand however i have an issue: On to the grow! Ive gone with some of dutch passions new AutoFrisian Dew. All 3 germinated so i popped them in to the box with the led around 10inches away (i decided to use one storage box for height to start with). As I'm new to LEDS 10 inches seemed like a good starting point for distance - temps were fine however.. growth has been poor to say the least! Almost none existent. The below image is at 2 weeks in soil! I have done some research and it seems this may be led burn, leaves are thick, all leaves were sad and seemed to wilt (not due to over watering).

I decided to introduce a 2nd box doubling the hight to 2.5ft, i removed 2 plants and have placed them in the green house to recoup and have added a tomato with the remaining Dew into the box to test for the best hight. The tom is around 27inch away from the light and again seems to be doing poorly! Stumped!

Questions:
1. Is my grow space to small for my led? Do i need a larger area, are my plants getting to much light..
2. Do i have an led that just needs a hell of a lot of head space? (if i add another box the light will be 40inch away from plants! For a small stealth box this seems excessive!
3. Is my led faulty? They seems bright to me!

I have planted two more batches of toms today, one batch in the green house, one in the box to test growth rate from scratch.

Grateful for any advise!

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No expert here, but it seems like you would want the lights closer to the plants, not further away. I run my lights (fluorescent) about 2" from the tops of the plants from start to finish (can't burn 'em with cool lights). Seems like the same would be true for LED.

thats not led burn. that plant looks like its drowning more than anything else or ph maybe.
you should fill out the troubleshooting form. need to know a little more.
it isnt the light tho. I have some seriously extreme led lights and i can get both of them within 12-18" with out any problems
and i have uv leds in my spectrum as well. if anything was really gonna burn it itd be uv.
10" inches should be fine. more room is always nice if you have the space and light to fill it.
try running both red and blue and see if it helps. plants still use some red in veg and blue in flower.
but we need to know about the soil ferts ph, watering sched. autos so light cycle dont really matter as much.

"White Paper" please. Soil, as in which type of mixture are you running with? IMHO if using a traditional store bought brand you're smoked! The community just had a quick overview on ideal soil mixtures as well as additives.... Teas etc. Don't despair & freak out, looks ok just a bit slow. Oh, btw..... Genetics have a lot to do with it as well. Could have a slow starter that will blow ur mind in a few weeks. Been there once. Take a deep breath cuz it'll workout. Kudos to the setup!!!!


:thumbsup:

Seeds were germinated in Coir, ph was a little high at 7.5, ec 0.6ms, temps were a little cold at night 11° lowest - however its a hardy strain. Watering was minimal. Wondered if it was something to do with the coir so transplanted - hense why the photo above is in soil.

Have grown countless grows before (my last indoor along time ago!) but this has me stumped. I suppose it just could be a mix of all the above being slightly off..

Cheers for the kudos!

probably right about that. everything i have read about autos says they are finicky about transplanting. might want to get them in a final container sooner than later.

Personally never toyed with an "auto". Must be fun cuz I hear they just start flowering at the strangest times!? Thinking on the lines of Token & put that bad boy led closer to the top!! Led's emit almost no heat so should be golden. Again, they look cool & you'll figure it out. You're Green, no doubt, PEACE BE UPON YOU!

:thumbsup:

Think i may have to respectfully disagree with you both. After having more of a think and research. I think its the light, to much, to close, to young. Read below taken from 6 Steps to Cure 99% of Marijuana Growing Problems | Grow Weed Easy

LEDs generate very little heat, but can still light-stress plants, so it's best to keep high powered LEDs (above 90 watts) at least 10 inches away from your plants. When the individual bulbs are bigger than 1W (for example if it has 3W or 5W bulbs), you'll want to keep the lights even further away, up to 2-3 feet for some of the newer, extremely powerful LED grow lights.

It's hard to make exact rules about how far LED grow lights should be from your plants, as each model is so different, so start with trusted lights that are proven for growing marijuana, and just be aware of the possibility of light stress. Start LED grow lights further from your plants than you think you should, and slowly move lights closer each day until you've found the "sweet spot."

To determine if your plant is getting light stressed from LED grow lights, you use the appearance of your plant's leaves to determine if the lights can be moved closer.

If leaves closest to the lights start showing signs of stress (leaves turning brown/crispy or buds being bleached white), move the lights further away.

Use extreme caution when attempting to move your grow lights closer, and avoid moving them more than an inch closer in a day, so you can watch the plant's reaction.

To elaborate because my box was only 3 cubic the amount of light was far to great in a convinced space for the seedlings to thrive. This has stressed the plants and stunned growth. :)

i have a 700 watt black dog light i can get within 12 inches or so to seedlings no problem, it isnt your light. blackdog makes some of the most intense leds lights around