LUCE-SPAZIO-PIANTE

That will be fine with light you have up until a point. Then I would definitely add the other 125w come towards halfway through veg. Hope this helps.

Oh and tent size you should be able to get them in but it will be packed but your not really running alot of watts so size of plants will be smaller comparatively

I would definitely increase the amount of light, the more light the better the more DLI the better if you have all the other parameters in check but if you're using the 125W for just sprouting adding a 2nd will only help but download tent buddy to make sure you're in the right range for PPFD and adjust you light distance accordingly, best of luck

As the buddy said, they are automatic, you can't control the size. Next time, use a photoperiod strain and grow with a SCROG net, it's going to give you much more yield.

4 small plants fit in 6-liter pots at most, and you need to keep an eye on the height anyway. If they stretch, you're screwed. That box is made for one normal-sized plant at most 2, but there's the SOG, and it's something similar you can look up online. For the second light, the space is small, but if it's dimmable, it could help in flowering; if the power is fixed, it's counterproductive. You should increase air circulation and fertilization.

Definitely going to be a packed house. These are autoflowers, so you don't control teh size.. with photos you could do 12/12 from seed and it might result in small enough plants, but in this case i think it'd get full either way. Can always prune some weak side growth when it gets compacted, if you have no other choices or extra lights etc.. It'll probably result ina better grams per m^2 outcome, because you can selectively remove the smallest stuff and should have more of the 'better' colas with more plants. The light is all about the area of coverage more so than number of plants in that area. Whether you have 1 or 5 in that tent, if the canopy is "60cmx60cm the light needs are the same, which is usually the goal, less any space for equipment in your tent that is in the way etc... With autoflower and a 18/6 light schedule or more you may only need 20-30 watts per sq ft depending on efficacy of your lights.. REad and react to the plants.. if internode (length between 2 growth nodes on stem) is too long, you need more light... if it is too short, you need less light. Somewhere between the two is the happy zone. keep some notes of how much power and distance from canopy you are using... once you find a good spot it won't stray far from that in future. (if you ever do photoperiods, you know you want 150% of wahtever works over 18 hours for 12 hours at same distance... or get it closer to achieve 150% of intensity at canopy -- assuming it can cover everything at that distance. -- proportional to hours of use per 24 hours) REad up on Daily Light Integral. You dont' have to memorize the math.. just understand the relationships involved is enough. light is ordinal and measurable.. the plant can only take so much per 24 hours relative to local variables... (e.g. 35-40DLI for atmospheric CO2 levels and at least loosely controlled environment.. and 50-60DLI for boosted CO2 with tightly controlled environment) What's great about learning DLI is that it matters not about efficacy of lights, hours of use or size of garden... "My" 35 DLI is the same as your 35 DLI. One of us may be able to push higher than the other, but the DLI provide is apples to apples comparison, otherwise. (umol/s , PPFD, DLI. .. these are teh terms you want to learn to use -- just like "EC" is better to use than ppm or NPK values for fertilizer... good reasons why mostly to do with communicating with others, like DLI does.)

That will be sufficient light. It depends on a lot of factors but having 4 once they get larger will be quite packed in there. You’ll be ok for the next couple weeks while the 3 new ones get bigger tho. If you think you can keep each of the 4 plants in a tight 30x30 space- then go for it.