even at that box size your ventilation is going to be a lot harder - not saying you can't do it but don't expect to just replace the light and go - i'd strongly recommend an air cooled hood.the box is 6ft tall 2.5 ft deep and about 6ft long and i plan to use just one will there be a big differnce in quality and yield if i just ues mh
so im gonna do 5 easy ryders in this space if i get a 400 watt hps and run my 250 and the 400 will that be enough lighteven at that box size your ventilation is going to be a lot harder - not saying you can't do it but don't expect to just replace the light and go - i'd strongly recommend an air cooled hood.
as for yield, i've never seen anyone do a side by side comparison but the logic is that mh gives off much less of the wavelength of light needed for flowering compared to hps. that means that a lot of the extra light in a 1000 is wasted.
you might want to think about a 600 watt hps instead. you're kind of in overkill range with a 1000 watt light in that box.
more than enoughso im gonna do 5 easy ryders in this space if i get a 400 watt hps and run my 250 and the 400 will that be enough light