No man I know what you mean. I have a 600Watt hort eye and I could use a bit more bush too.
If you are running a 18-24 hour cycle then go buy a MH conversion bulb for your exsisting fixture. Run it for a few days/weeks then switch when you go to 12. But myself I do not have one because I don't have a veg stage. I go directly from clone to flower. Well at least within a week or a even just a few days after rooting.
So for me I just keep them under my 4' full spectrum fl fixture untiill they have enough leaf.
"Prohibition...goes beyond the bounds of reason in that it attempts to
control a man's appetite by legislation and makes a crime out of things
that are not crimes. A prohibition law strikes a blow at the very
principles upon which our government was founded."
-- Abraham Lincoln, December, 1840