if its just the 4 foot fluros you will be ok but your gonna need a light proof room if your gonna have any darkness

so leave it on 24 with just fluros and when everythings ok with your grow spot switch to your M h

they wont freak out that much but you really should have a designated grow room!

when you finally switch back two mh you should start it back on 18/6 and if the plants are ok size to you set it 12/12 for flowering!