this is what i have said before i have found on amazon..it's not about better or worse in this case,it's about math!! It's more efficient to get the 450w Vipar as it is better in wattage and HID equivalence!The 450w Viparspectra (400w MH equivalent) on 140$ the MarsHydro 300w is 150w HPS/MH equivalent for 80$