help for newbie needed - height

Hi,
i have my first grow flowering and producing ton's of buds, my problem is the plants seem to grow more and more and have taken up more space than ever, i no have minimal room between the top of the lights and the roof of my grow room (few mm) and then not much space between light's and the crops, my problem is i cant allow them to grow to high and i cant bend them too far as i have 6 x plants in a large tub i made and one plant may bump into another blocking light.
does anyone have any solutions that may help? the plants are roughly halfway through flowering stage so i cannot afford to waste a good crop.
also heard 14/10 light cycle can increase yield, if so when should i be thinking of putting this into place?
thanks and happy Growing/Toking.

hmmm i dont think you have anything to worry with your light being that close to the roof... but as for the plants how cloase are they to the light cuz you dont wanna burn them.... and yes lowering your light during flowering stage will up your yeild.. this is cuz when a plant thinks it is dieing its natural ability is to reproduce its self, also lower temps will do the samething,, the reason why a MJ plant flowers at 12/12 cycle is cuz they think they are dieing.. i always have my light at 12/12 for the first few weeks then i start takinit back by the hour and for the last 2 weeks of flowering i have mine at 10 hour light and 14 hour dark

you can twist your whole room move one left or right and keep following all the way around till its lower like a spiral

thanks for the advice,
will be altering my room a little tonight to make sure i get the best out of my grow with a good maximum yield.
will start to alter the light in a few days as these are around 30 days on 12/12 lighting,
thanks once again