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 double ended MH bulb produces a very balanced and efficient spectrum of lights designed perfectly for flowering, budding and fruiting.It is among the most energy efficient sources of indoor sunlight available.The bulb emits a blue/white spectrum that sets off hormones in plants resulting in faster growth, bigger crops, and larger harvest.Average lifespan is 8000 hours for each bulb
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