So I got a email from dan hope this helps clear up what's needed for what hps replacement , here it is :::::
Thank you for your email. These lights run about 40% more efficient than a traditional SE HPS light. A 1kW HPS equivalent COB LED would pull roughly 600 Watts at the wall, yet produce the same amount of PPFD output @ the canopy with far less heat.
Our lights are passively cooled so there are no moving parts and create little additional heat in the growing environment and require far less HVAC than HPS.
To convert a room running 4kW of HPS, you will need about 2400 watts of COBs. Our lights are available as kits which are pre-wired and ready to be attached to your own fabricated frames, or we also offer ready to hang fixtures as well. If you were looking for the most cost effective ready to hang fixture for your area, I would consider (4) of these:
http://timbergrowlights.com/600-watt-vero29-v7-4x4-framework/
I hope this helps - if you have any additional questions, please feel free to let me know.
Best Regards,
Dan