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Horticulture Lighting Group are the pioneers of Quantum Boards. They offer some of the most efficient LED grow lights on the market. Their V2 LED grow lights feature Quantum Boards with Samsung LM301H diodes. This is a previous upgrade from the LM561C diodes on their V1 boards. Available in Rspec or Bspec spectrum options. The 3000K and 4000K spectrum is available on their HLG 550 V2 Eco. Their most powerful fixture is the HLG 650R, coming in a 1770 umol/s of light and an efficacy of 2.81 umol/J! Start growing today with HLG lights and cut your heat and power bill in half!