Plant & Herb Growing Kits descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. Self-ballasted Mercury Lamp. Features Self-ballasted Fluorescent High-pressure Mercury Lamp is a Gas Discharge Lamp, the Lamp Within the Limited Flow Filament and Quartz Arc Tube in Series, Current Limiting Filament Not Only Play the Role of Ballast, but Also a Certain Light Output. Thus, the Lamp Has the Advantage of Eliminating the Need for an External Town Flow, Light Color is Good, Start Fast, Easy to Use and So On. Can Be Widely Used in Streets, Stations, Docks, Car Parks, Industrial and Mining Enterprises and Other General Lighting. Second, the Use of Precautions 1: Self-ballasted Fluorescent Mercury Lamp Must Be Vertical Lighting, or Self-extinguishing Phenomenon. 2: Light Bulbs Must Be Wired in Accordance with the Wiring, in Order to Correctly Use. 3: Bulbs Are Screw-type Lamp Holder, the Studio Charged in the Maintenance of Replacement Bulbs, It Should Be Cut off the Power, Pay Attention to Safety. 4:the Power Supply Voltage Fluctuations in the Range of +6% - -8%, the Lamp Can Work. Power Supply Voltage is Too High or Too Low, Will Affect the Normal Light Card and the Life Span.   Lamp Base:125W/160W(E27)                   250W/450W(E40) Voltage:220v   Package Included :   Self-ballasted Mercury Bulb     1pc. Products number : SOMONO151440