I grow in a closet (2x4x
and use a 400w HPS....inline fan with ducting to pull through carbon filter, hood and able to exhaust into attic...I am actually in the process of upgrading/changing it up and purchased a 2x3x5 grow tent (used $80), Area 51 LED ($500), bought new phresh filter ($75). I am utilizing my same inline fan 4" 180 cfm ($130). I did this to make my setup a little more stealth, LED produces less heat, less fans, less noise (can lower speed of fan). Also the light I ordered is meant to cover a 2x3 area and I do a small grow. I originally was doing 4 in that space but got it down to 2 plants that I train and scrog so it will fill in and produce as much as 4. I felt it was easier to manage less plants as well. I do dirt and use DynaGro nutes ($15.00) per bottle (Grow, bloom, ProTekt). Will need some PH up and Down as well. PH meter or test kit, TDS meter maybe too (not required upfront but useful). I am getting between 3-4 oz per plant, last harvest with my HPS was 7 oz did some mainlining (no scrog). If you make a separate veg/clone area you can harvest more often too....HID light will cost less upfront than LED but you are going to run into heat issue's, require more exhausting, fans, bulbs, etc...How big is this closet? The one downside of the LED is coverage area but if your in a space like mine the LED would be a wise choice. Now if your in a walk in area that is 4x4 or larger then you may to stick with HID or will go out of your budget. I wouldn't go less than 400w unless your telling me you have a small area like 2x2 or something.