2 High Efficiency QB-288 or QB-304 Quantum Boards.
Equivalent to a 500 Watt HPS, two of these will replace a 1000 Watt Gavita single ended grow light. Three of these kits equal a double ended 1000 Watt Gavita!
@robincnn @Stephenj37826
I just came across this link in a thread on here. Is the...