need some advise - running out of space

hi there, happy newyear everyone, im a first time grower and the plants have shot up quicker than expected. I've just started to flower them today but a few shoots are almost touching my light. im using an envirolight 200w so the heats not scorching but i really dont want to get any leaves to burn, melt on the bulb and blow it.
I understand that when the plants are well into the flowing stage they stop growing vertically, and flowering is brought on by hormones made in the night destroyed in the light. to speed up these hormones and stop vertical growth should i mayby switch to say 10hrs of light 14 of night rather than 12/12? or should i just crop the plants by snapping back the branches of the leaves near the light? I've read that you shouldn't crop them during flowering to minimise stress but im guessing less than 12hrs of light would also lower the amopunt of bud, my main concern is the light tho i really dont want it to burst.
I cant move the light up or the plants down btw.
thanks

I would try tying them down a bit before hacking your plant. Leave the photoperiod alone.

Welcome to RIU

Seeing that you just started flower and are not far into it, you can bend, top or tie them back. They will grow about 3x the size they are now so if you have height issues at this stage of the game them you might need to look into a bigger cab ASAP.

thanks for the advise guys, problem solved tho i came in on nye absolutly wasted snapped a plant nearly in half and ate some of it oh wel u live and you lern, hopefull it won't of stressed it too much

its going to change so much during flowering you'll be surprised that topping might just have been the answer