Introducing the ROI-E680 Horticulture LED System by Growers Choice. An inspired collaboration between two of the most respected lighting companies in the horticulture industry. TSL Horti Tech and Grower’s Choice have joined forces with years of innovative experience to create this high performance and cost-effective lighting solution for commercial and home horticulture. SPECTRUM SpecificationsModel NumberROl-E680Light SourceLEDSpectrumGC-3K Full PhasePPFI700 μmol/sInput Power680W Efficacy2.5 μmol/sFixture Dimension/Weight42.4 L x 42 W x 2.