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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...