400w Metal Halide for first month of flowering?

[stinkyattic]

If you have the means to use a mh then use it during the stretch or just until you see buds start to form. MH bulbs will help decrease the stretch. .

This is FABULOUS advice. During this period you can also continue to use some nitrogen in your fert schedule. Then go up to a 600 or even 1000 HPS to finish.