Advice needed please .. with pics

here is a few pics from 4-5 days ago .. day one of 12/12 .. looking great .. no burns and no yellow/brown leaves ..
been in the room with the HPS for allmost a week on 18/6 (also why I dont belive it is heat burns)

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Im realy lost here so hope somebody can help me out .. now I begin to think they might need some more of some kind of nutriens or sumthing .. wouldnt like to do sumthing to em before I had some advice .. dont like to make it even wors if I go in the wrong direction ..

What is your PH at?
Also it is hard to tell from the pictures but it looks like the only leaves dieing are the ones that get very little light, if so this happens naturally during the plants growth.

Ph of water is 6,5 ... runn off is 6 - 6,5

last time I made a dirt tests it was spot on ..between 6 and 7 (around 6,3-6,8 I belive)

and yea they get close to non light now I think about it .. Lol .. nub grower

did`t like/know how to lolipop em to much .. did only remove leaves that was tutching the dirt or close and some of the bottom bud sides .. but maybe I was`t "hard" enough ? schould I remove em now ?

so yea as it is a kush plant with big leaves and they are bushy do to LST/FIM the bottom growth dont get much light I guess .. even tho I manages to keep the HPS around 20 inchs away .. grew up to 18" in two days

I recommend running anything 600 Watts or less 6-8 inches away from the plant canopy in a well ventilated room.
You definitely should remove any leaves that get the point of the ones you showed in the pics above.
Start about 8 inches away then put your hand at the top of your canopy if you can comfortably keep your hand there your likely to be safe.

600W HPS

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I keep it around 20 inches away as it is not a cooltube Im affraid .. plants grew up to 18 inches so I move em down even tho tmps is like the same .. 82F is around wher I can keep it .. a bit high but schould still be ok ..


got a 100mm canal fan with a carbon filter going ..

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a littel bit on the small side I know .. also why I runn it at night to keep temps down ..
tho it can still remove my air in my room (witch is 7x3 feet and 8 in hight) with in 3 minuts .. I belive more like 5 with the filter on .. but it still get lots of fresh air .. intake comes directly from out side and a got a tower fans lieing down at the intake to help pull more fresh air in and spred it around the room ...

and of course the big table fan blowing at the HPS at a angle that blow the air pass it and up at the filter/ventilation ..
with out that I would have temps close to 88F

If you have good airflow you could get that light a lot closer and easier add 30% or more to your yield. I don't use a cooltube and right now my plants are closer to 3inches away with no burns and no c02. My area is 4x5 W and roughly 6ft tall.

Like jvo said, the lower leaves are gonna die due to lack of light. Continue bending your branches to get the most out of your light and you will get a good harvest. The plants look good though. I always flush with 3-5gallons of water in my 5 gallon buckets at week 2-3 of flowering to get rid of excess salt buildup. After flushing, just do a light fertilizing treatment and continue on with your feeding/watering program up until the last 10-14 days before harvest then flush again.

If you have a 600watt, you need to be 14-18" on open air fixtures.....can get a little closer if its air cooled

Originally Posted by jvo

If you have good airflow you could get that light a lot closer and easier add 30% or more to your yield. I don't use a cooltube and right now my plants are closer to 3inches away with no burns and no c02. My area is 4x5 W and roughly 6ft tall.

What kind of light through? No way it could be that close to plant tops if it was a 600watt HPS light....my 400watt HPS lights literally burn my hand if it is within 6 inches...I run my 400watt lights in air cooled reflectors and keep them about 10inches from the tops, but a few years ago i only had open air fixtures and had to keep them about 16" or so from the tops. Also obviously has a whole lot to do with ambient air temperature