i want to have around 40 cuttings till there ready for flower in this box how big do you recon it should b? and what lights? thanks matt

I'd guess it depends on what size pots you want to flower in as you dont really want to pot up when your on 12/12

unless .......... you use the veg room for the 1st few weeks and finish vegging in your flower room (18/6 for a week or two to get them to there final pot size)

i use rockwool cubes then in the flower room i use gullys so soon as i see roots i was going to transfer them to the gullys in my flower room any ideas how big?

sorry I presumed you were using soil/compost

pretty obvious to me .... imagine how big one single plant will be when you're ready to move them to the flower room then mutiple that size by 20

If you are going to move them into the flower room as soon as you get roots I imagine they would be pretty small so if you wanted 100mm by 100mm for each clone then at 4 deep and 5 wide (making 20 plants) I work that out to be 400mm deep and 500mm wide, then you need extra room around and between etc but that gives you a figure to work with

If your using a prop tank for your cuts then just work out how many tanks you will need, and then work out the space for the light on top and then u got ur measurements