Brand: LSE Lighting® Type: Ultraviolet 254nm Length: 18" Base: 4Pin-T5 Ceramic Base with Flange for Mounting Glass Type: Quartz Glass Tube Effective Hours Rating: 12,000hrs NOTE: Please ensure that you need the lamp which has Flange on the base for mounting as on the picture. This UV replacement lamp by LSE Lighting brand is 100% compatible for use with Second Wind HVAC UV models 2000, 2018, 2181, 2000-230 which require the bulb with flange mount for mounting. All lamps listed are compatible LSE Lighting brand UV products. We do not sell Second Wind brand lamps. All Second Wind brand names, trademarks and logos are property Second Wind. All UV lamps are manufactured in EPA Registered Facility: EPA Est. No. 96823-PA-1 All lamps listed are equivalent brand UV products, manufactured to OEM specs and quality This UV replacement lamp by LSE Lighting brand is 100% compatible for use with Second Wind HVAC UV models 2000, 2018, 2181, 2000-230 which require the bulb with a flange mount for mounting All lamps listed are compatible with LSE Lighting brand UV products. We do not sell Second Wind brand lamps. All Second Wind brand names, trademarks, and logos are the property of Second Wind Brand: LSE Lighting