About SeztekOur mission is supply you the best products,pre and after serviceIf you are dissatisfied for any reason,please give us an oppotunity to fix and improve it for you.Customer ServiceResponse within 24h;30-day money refunded guarantee.InstructionsThe SEZTEK 400/1000W Metal Halide Bulb lets you grow better by providing reliability and performance.No longer at the mercy of the weather.By concentrating its output around 450-500nm (blue to white) wavelength of light, this bulb provides the essential spectrum needed for most plants on maximizing short internodes and chlorophyll density.Compatible with all standard 1000W digital ballasts
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