MH or HPS?

[donkeyjunk]

G'day,
i need to switch my girls over into the flower room in 10-14 days.
im running a RDWC system, with x6 MH bulbs (600W),
i have been tipping (topping) them so they are quite bushy ,but only about 50cm (1.5 foot) tall .
i really need them to double their height in the next 2 weeks before they go into the 12/12 room,
-someone told me that if i change my bulbs over to HPS for the next couple of weeks they will grow taller than if i keep the MH's in?
-( im using high end LED's in the flower room)
can anyone tell me if this is true, using HPS instead of MH for next 2 weeks to get taller girls, and how high above the plants should the bulbs be to get the best vertical growth in my bushy girls.
cheers
donkeyjunk

 

[Nunyabiz]

Just use your LED.
The MH has a fair amount of blue spectrum is why the plants are short and bushy.
The HPS has more yellow/red spectrum which is better for flower.

Odds are the "high end LED" will most likely have an even better spectrum for flower than the HPS.

 

[bruno12345]

You can use hps for trying to stretch.
Dont think two weeks Will make them Double in size.

But when you Flip to 12/12 they may stretch a little bit more in the abscense of BLUE light.

Sativas may double to almost triple the size when they are flipped to 12/12. Indicas tend tô 1.5x to a maximum 2x of the preflowering height.

 

[donkeyjunk]

cheers

 

[bobrown14]

So you topped your plants and now want them to grow taller??

Thats an interesting approach.

Try amending with kelp meal, malted barley ground fine, ewc and Ful-power. Kelp has natural plant growth regulators that will help with cell elongation in the short term.

Make a tea let sit for 4 hours shake and dilute with water. It's not subtle.

 

[donkeyjunk]

cheers but cant as im on a fully synthetic RDWC, organics throw the pH way out of whack