mixing light

My 250 hps likely provides too little light for all the clones that are vegging under a 450 mh and ready for 12/12. I have a several ladies already on 12/12 under the 250 hps. If I add my mh to the hps to allow room for all the ladies to mature, how will the mh affect my ladies currently under hps? Will the mh be a detriment to the flowering process? Should I forget the mh and get a larger hps? I will be cloning and vegging with fluoros if I combine the lights.

alot of ppl on here ive heard get there clones going with floros....maybe that can buy you some time to get a bigger light if u need it