Help de decide tent and light for my setup

Depends on efficacy of lights and if you want option to do photoperiods. autoflowers will be anywhre from 22watts/sq ft to closer to 30watts/sq ft depending on efficacy of the light. with photos yuo need 30-32watts/sq ft to 40+ watts/sq ft DLI is a bter measurement to get familiar with. You want to be somehwere around 35-40 DLI with ambient co2. Daily light integral. wiki page is sufficient to learn. You don't have to memorize the math to ge the gist of it. 10w in a 2.3 x 2.3 woulddn't be so bad.. you can figure some equipment may take up space and adjusting hanging distance to properly focuse all of your light where it will hit the most canopy will probably work out very well. If it's a highly efficeint light you'll be up near 35-40dli over 18hours of operation and with less efficeint lights you mgiht be closer to 30 DLI. Well formed buds start aroudn 23-25DLI, for a point of reference. You get better yield with more DLI and greater proportion of good nugs vs larfier nugs. 300w in a 2.3x2.3 area would be insane. if the plants do tolerate it, it's only b ecause tehy adapted to it.. they can still only process 35-40DLI in ambient co2 conditions.. simply cannot fabricate carbon otherwise.