LSE Lighting 70-18410 UV Bulb for Delta EA-3H/4H-10/E10/EA-18 Wattage: 45W (HO - High Output Lamp) - Bulb Type: Ultraviolet Germicidal UV Lamp Base Type: T5 4pin Base (4pins on ONE END) Length: approx 20" This replacement lamp by (LSE Lighting) brand is 100% compatible to use with Delta Ultraviolet Sterilizer Models EA-3H/4H-10/E10/EA-18. All lamps listed are compatible brand UV products. We do not sell Delta Ultraviolet brand lamps. All Delta Ultraviolet brand names, trademarks and logos are property of Delta Ultraviolet.