Is to much light harfull for small plants?

[dvine]

Im having problems and i have now basicly looked into evrything possible and start woundering if its my lights that messesup my small babys...
Im using a 250w mh (35cm disnstance) +2 florecents (10cm distance coldblue) for my maby plants (2 leafs +the 2 round leafs).
The thing is that some of them have started to go yellow, some at the tops and some at the veins.
Im starting to wounder if it the same thing as it is with clones. To much light and the clones start eating of the self to get nutrients.
I was thinking the same for smal plants. Small plants have realy small roots and and therefor eat of them self to get nutrients for new growth going.

Is it possible that i have to much light on my plants this early in the stage and therefor making the act so strange? If it is so then would it help just to move the plants further away from the lamps just to lower the intencity of the light?

 

[st0fr]

I'm only on my second grow, but I've started both my grows with 400 watt HPS.

This time I'm using a cool tube and I've had the light as close as 30 cm to the little plants.. They where, and, are doing great..

Post a pic of your plants..

 

[SweetIndica2]

It would take ALOT of light, to have too much light. I have even started seedlings under my 1000w and have never had any problems. You'll be fine.

 

[pico]

Too much light can deffinately screw things up. Not saying for sure that this is your problem, but it is possible.

Ease your plants in to things. Start with your light up high and lower it a bit each day. Even big plants can get shocked/burned if you go from low power light to high power light.

 

[mariothejerk]

I would say just raise you lights 250w 35cm wow thats ways too close for plants that small I would place the 250w light at least 3 feet away until maybe the 3 4 reall set of leaves come out.

 

[dvine]

I do not have heat problem, i use a good soil (the drainwater is at 6.7) that is mixed with 30% perlit, i have awsome ventilation, fans directed at lants and so on. The thing is that last time when i used LE to grow it then nerly all of my plants bacame huge but now they all have diffrent symptoms :/

 

[SweetIndica2]

Yea, too much light isn't a problem, too much heat is like oblidio said. I have an aircooled 1000w and have grown seedlings under it, at only 10-12 inches away and have never had any problems. The lens on my hood stays cool to the touch, so there is practically no heat hitting the plants.

 

[floroscroger]

Looks like a nutrient lockout to me. What is in your soil? The purple stems indicate a mag defficency. Maybe do a folar spray with some epsoms salt.

 

[dvine]

About 10/16 has purple stam, some more some less but something like that.

Its in swedish but you should be able to still understand. if not the ask me what part to translate.

I read that you can correct this by adding 1 tbs of "magnesium sulfate/Epsom salt" into 4L of water. Is that correct ?
Lets say i want to fix the problem so i dont have to add it into the water but only to the soil, what should i be adding then?

 

[floroscroger]

Just water it into the soil. If you use it as a foliar only use about a teaspoon per gal.I think your soil may be too hot for the young seedlings. Tender roots burn easily. If it were me I would flush the soil real good to get out as many of the ferts as possible and then add the epsoms.

 

[fatboycantpost]

flush and STOP fertilizing them. they are WAY to young for that.

when they get too much light they will "cup" trying to avoid some of the light. you'll know it when you see it.

generally as far as the leaves going yellow. that's an odd one for these young plants. they should still be feeding off the seed. yellow leaves at that age is not right.

another problem might be that you are overwatering them. they need to get kinda dry between waterings. practice makes perfect.

good luck.

 

[dvine]

Can over watering realy get them yellow?
hmm.. no nutrients at all, sound resonable... gonna go for that for now and see what happends

 

[emoisevil629]

you can't have to much light, you can have to much light to close though. Not many lights are brighter than the sun, which definitely can grow a thing or two

 

[PHANTOM]

keep the heat down and light is not a problem.

PHANTOM

 

[gesseg]

Any chance its poisionous gasses from MDF or some doggy plastic or something?

My seedlings looked exactly like yours before I moved them out of my poisonous grow cab.

Have a look a the pics im my gallery. The clorosis is identical.

 

[dvine]

my growspace is newly built by me by new wood only. Thare is some realy good ventilation as well so i doubts its that altho they do look simular...