When to change from mh to hps

can someone tell me when should i change my light bulbs from mh to hps should i change them as soon as i turn to flower as i've been told to do it after 2 weeks into flower and the same as the nutes im a bit confused thanks

Hey bro ..... During the first 2 weeks after your change your light cycle to 12/12 the plants will stretch a lot. You want to keep your nutes still veg nutes to support this explosion in growth. Also, you want to keep the light spectrum that of vegging (so still MH) also to support the growth and reduce the stretch a bit. When your girls stop stretching too much or at least slow down and you notice more and more pistils are forming, that's when you switch to HPS and change your nutes to bloom!
I hope this helps and happy growin

I keep mine under mh for at least 2 weeks into flower, and still on 'veg' nutes 3-4 weeks into flower

Thanks for commenting guys. I found this helpful as well.