Can anyone help with opinions???

Hi I'm trying to start a new grow and I'm interested in T5 lighting... Im just curious on how much lighting I will need for my 4'x4'x7' grow tent??? How many Lumens would I need for two plants in that size of a tent??? Thanks for anyones opinions...

dont know about T5s but i have 30-50,000 lumens hps in a 4x4, i would wait for a t5 user tho they would probably b more helpfull