I have to disagree here, while 150 will grow a plant, 250 is a minimum, and 400 would be ideal ... I also have a 2'x4'x7' ... also, you should have plenty of room for 4 plants ... I used to grow 8 plants in that size cabinet for years, just down-sizing to 6, then 4, in last couple of grows ... will go back to 6 next time, I have available space with just the 4 ... :smokin: