- Type: Preheat
- Wattage: 21 Watt
- Lamp Type: L
- Lamp Base: B4
- Nominal Length: 436 Millimeter
- Life in hour: 10000 Hour
- Additional Information: Quartz Outer Diameter 15 Millimeter; Output Type Standard; Current Rating 425 Milliamp
STER-L-RAY® Preheat germicidal lamps are operated by a preheat start circuit that employs a relatively compact and economical ballast. The preheat circuit requires four electrical connections per lamp and a slight to moderate delay is needed to start the lamp. Some modern electronic ballasts are capable of instant starting a Preheat lamp. Available in Low Ozone and Ozone Producing versions. Our STER-L-RAY® brand of Germicidal Ultraviolet Lamps can be used as equivalent replacement lamps for over 250 equipment brands and 5,000 models of ultraviolet equipment besides Atlantic Ultraviolet's Air and Water Purifiers.