Small plants after switch to HPS

Hi all.
I’m only on my third grow so lots to learn still.
I recently upgraded my 70x70cm to a 120x120cm grow tent.
my existing LED light did t cover anywhere near the area so I’ve bought a 600w HPS kit which is running a 600w dual spectrum bulb.
The plants are now 3-4 weeks but as you can see from pics they’re really short (about 15-20cm) although there are quite a few nodes theyre densely packed.
With my LED the plants were a LOT taller.
Should i be worried?
You’ll also see the leaves were folding. I think that was the lights being too close and hot so I’ve raised them from 2ft above plants to about 3ft so hopefully that’ll help.
Any advice would be appreciated.
They are Fast Buds Purple Lemonade and Gorilla Cookies. Both auto feminised.
Temps are 28C day and 18C night on 18/6. Humidity is around 50%. I cant really reduce temperatures any more though i think theres plenty circulation.
Cheers
 

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is the light a dual bulb mh and hps? thats what i have i use the mh for veg then the hps for flower about 18 inches is the sweet spot for me in veg
 
Just a single bulb. Omega 600w HPS.
I’ll back the light off a little bit more and see how they do over the next couple of days.
thanks
that light will get you a nice harvest just when it comes time to switch dont be afraid to lower it i run about 16 inches above the canopy
 
Autos are usually short & stacked. Tall stretched plants aren’t ideal anyways ya cant smoke stalks. They looking good by the way
 
So its been a day and a half since lights were moved up.
Leaves seem to be looking better and I can see a bit of growth and stretch.
Should I leave lights where they are or start inching them closer?
 

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They’re looking great.
What medium are you growing in.?
Miracle-Gro organic soil mixed with 40% perlite.
In the first week I accidentally watered them with full strength nutrients and almost killed them..
The photos of them plants almost dead are from November 30th.
The green photos are from two days ago.
 

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Miracle-Gro organic soil mixed with 40% perlite.
In the first week I accidentally watered them with full strength nutrients and almost killed them..
The photos of them plants almost dead are from November 30th.
The green photos are from two days ago.
I have a post up called "a few messed up plants"
That post shows how we saved those plants.
 
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