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

Probably just shorter due to more light, I wouldn't worry about it.

Short in veg is a good thing.
More room for the stretch for your soon to be bigger plants.

Welcome to the hps club.

Back the light off for a few days for them to get adjusted to the new intensity.

Best of luck.

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

mine were short 22 inches at flip now 2 weeks later 47 inches

Before and after flip 18 days in between with 600 hps

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

GrandpaPurple said:

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

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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?

Get them as close as recommended

OK. What’s the best distance for a 600w HPS during veg?

GrandpaPurple said:

OK. What’s the best distance for a 600w HPS during veg?

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I run mine at 24 inches. Seems to work great.

They’re looking great.
What medium are you growing in.?

GrandpaPurple said:

They’re looking great.
What medium are you growing in.?

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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.

Lastmanstandin31 said:

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.

Click to expand...

I have a post up called "a few messed up plants"
That post shows how we saved those plants.