Anyone grow skunk #1 or red shiva?

[choking_victim]

I have a group of skunk, shiva, widow, and one other variety.
my ballast went out last week, forcing me to return them to a 24/0 of FL's and CFL;s, (just 4 T12's and 150w CFL. after just one day of flowering.
my question is..
how do I get these bad girls to stop growing for the meantime?
The skunk, and shiva are just growing more up rather than bushy.
They're right at 2 feet tall; on top of a tray, on peices of rockwool slabs,
giving it 4 feet of space from the tops, to the ceiling.
with a 600w light and good air ventalation I have 3(+-) more feet..?

if anyone has grown these strains before (not widow, she's only 1'2")
I'd like to know if they're gowing to be a problem when maturing with my space?
​

 

[HippyInEngland]

Yo Choking

Ive grown skunk b4 several times, i topped her twice to keep her short, she still grew to 3 ft, i have no experience with your other strains