Jojoe, to clerify the point is to try and stop them from growing leggy, because usually once that happens the plant is weak and the shoot dies back. It will hopefully sprout new growth lower on the shoot - but that can take a long time and if its happening every year, then your plant won't grow big for a long time!!
If your plants are getting leggy it doesn't just mean that they have low light, it also means they have the "energy" to grow.
So try to keep the plant from getting leggy by withholding nutrients and water the way that you're withholding sunlight.
Its a temporary thing, and isn't ideal but the plants will probably do better if you do this.
Then once they go back outside and onto the regular water/feeding schedule they'll bounce back and be strong and vital again!
I hope that makes sense, if not keep asking and we'll finally get to the point!
For years I've heard people say "if you're plant is getting leggy it needs more light" and I'd think "I don't have more light to give" "What now?" then a succulent plant expert explained about the energy to grow mixed with the low light environment, it cleared things up for me, I know now that my succulents need to not be fed and barely watered in the winter when they're indoors
Cheers
