First off sorry if this answer is somewhere in the forms but i am getting back into growing again . i have some old gear around 7-8 years old it worked great in its day but things seem to of advanced. i currently have a 400 wt mh and a 1000 wt phs old steel box system . i am in the market for something newer i have looked around and has asked but still looking for some opinions. i am using a large grow tent about the size of an old phone both any one have a suggestion . i have noticed a system that the bulbs are inter changeable is that true and how well does it work ? thanks