hmm between 300 and 500 huh
I know before my first harvest was over I already had a list as tall as my states budget!lol
Be sure to make ur room adaptable to add more light ventilation co2 hydro ect. ect..
Realistically ur looking at prolly more like $1500 - $2000 to use a 1000 watter effectively
otherwise you should just buy a bag with that $500 because without proper planning and investment (unfortunately)
the only yeild youll get is a house fire