Will my plants burn? Please help

[what420]

Hello guys i am a new grower its my second indoor time now. I am currently in week 2 Flowering of AUTOFLOWER MOBY DICK
Specs
6x Auto Moby Dick
HilmaPot 10
General Hydroponics Trio MICRO GROW BLOOM
2x600w
3 AIR FANS
Air conditioner
PH 5.7
PPM 1800
24/7 light cycle
My plants are very big i havent trained them they are now around 30 cm from the lights. I think they might get burn. Dont they stop growing in height in the middle flowering ?
Temps 30 C.
I am thinking in swithing to 12/12 as long as i dont get my buds burn!!.
Please help
Grow Space 5x5

 

[what420]

switch 12/12 is the only thing i can do?

 

[chemistry]

I'd flip, you have enough tops for your given height and space.

 

[Beachwalker]

I'd flip, you have enough tops for your given height and space.

+1