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 400/600/1000W High Pressure Sodium Bulb lets you grow better by providing reliability and performance.Provides 34% more available energy than the standard high pressure sodium lamp.No longer at the mercy of the weather.By concentrating its output around 550-600nm (yellow to red) wavelength of light, this bulb provides the essential spectrum needed for most plants on proper plant elongation, and maximized photosynthesis efficiency, proper fruiting, blooming, and flowering.Compatible with all standard 1000W digital ballasts
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