thats why my brother and i made a 2nd box, to have the ability to harvest 2x as often. our first box was 2 large tubs ontop of each other. the 2nd box was 1 smaller tub with a lid. the smaller tub had a totally different atmosphere than our first because of its smaller size, which we didn't account for, so we ruined the first 3 seeds right away cuz we grew them like we did in our larger box. they dried out so we put a small humidifier in the box but that was too moist, so that killed our next 2 and we only had 5 of the white widow seeds. then we tried growing the auto flower seeds that came for free with our white widow seeds and we fucked them up. so that frustration made us decide to get a bad ass grow tent (when we get the money). in the mean time we are growing a couple in our original box. trial and error....sucks but i have learned alot. if i was you i would stick with what works. make your 2nd box just like the first, but have more 6500k lights for your veg and more of the 2700k lights for your flower box. i read that plants like a mix of light, and having 2 to 1 light bulbs for the stage of development is optimal (2 6500k lights to 1 2700k light for veg, 2 2700k lights to 1 6500k light for flower). i think the hid lights that only produce 1 type of light are so powerful that its not necessary to give them multiple types of light. so for design ideas for your 2nd box should be easy, copy your 1st box that worked but make the necessary changes to support what stage your plants will be in for the new box. i dont remember seeing pictures of the design of your box. i assume you got an exhaust fan and at least a hole on the other side to suck air in from. when summer comes we'll probably have to add an intake fan to cut down the temp a bit. but thats gonna change the humidity, so we will probably have to get a large humidifier and put it outside the box next to the intake. thats something i learned too, put the humidifier outside the box, not inside, lol.