Induction or LED $600

2x4 grow area which one would you choose and why? Or should I stick with a HPS and invest in cooling? I also want to keep light bill low to.

Led , a51 xgs or 2 Hans led (bonsaihero.com) would probably be better for your space. If you were goin for a larger area than induction would be better. Both yield very well and produce better quality than hps. Run less watts and much lower temps than hps. Either with induction or led you will be happy with the switch.