GermGuardian® LB5000 UV-C Replacement Bulb is a 8-watt bulb. UV-C light helps reduce airborne bacteria, viruses, mold spores*, and works to reduce volatile organic compounds. *Tested with Staphylococcus Albus, and Escherichia Coli, Aspergillus Niger, and Phi-X174. This bulb needs to be replaced every 10-12 month depending on use and environmental factors. It can be used for the GermGuardian® Air Purifier Models AC5000, AC5250PT, and Lowe's® Idylis Model IAP-GG-125. The use of this genuine Guardian Technologies™ replacement part will maintain the product's performance.