LSE Lighting 70-18440 UV Bulb for Delta EA Pondmaster 40 EA-40 Brand: LSE Lighting - Cross Reference Model # for compatibility purposes: 70-18440 Wattage: 41W - Bulb Type: Ultraviolet Germicidal UV Lamp Base Type: T5 4pin Base (4pins on ONE END) - Length: approx 42" Cross Reference Model # for compatibility purposes: 70-18440 This replacement lamp by (LSE Lighting) brand is 100% compatible to use with Delta EA Pondmaster 40 model EA-40.