wants 2 flower

i have 4 plants each about 1-1 1\2 feet tall
i have them in a grow box about4 feet tall i have 2 cfl 100watts and a 150 watt hps light on18 and 6 on timer with an exaust fan they are about 3 months old if i wanted 2 flower now how much yeild can i expect and when i do should i turn off the cfls and just have the hps light on 12 and12

Its hard to tell how much you will yield because so many things play a factor in that. But i would switch it to 12 12 and keep the cfls as side lighting. Because more light is better.
And it never hurts.