hey MadameMary, it's all about the genetics that you're using. The basic theory is that you want to maximise the space that your roots use. So for example if you use a 10 gallon pot but your roots dont use all the space then you're wasting space in the end. Same if you use a too small pot and the plant needs more space then you're missing the chance to get more yield. the second point is you want to reduce the amount of transplant stress your plants will feel : so if you transplant 5 times before the final pot then you waste time maybe and it makes the grow cost more because you need to use the lights, electricity etc. So finally to answer your question, probably it's possible to germinate like 45 seeds in 500ml pots with like 8 LED strips for 20W 6500K in a 1 sq m. Hope this helps ! 🚀