Lb4000 Bulb 3 Pieces Lb4000 Light Replacement 5 W Bulb Compatible With Germguardian Lb4000 Air Purifier Models Ac4300Bptca, Ac4825, Ac4850, Ac4850Pt, Ac4900, Ac4900Ca, Ac5300B, Ac5350B, Ac5350 Item Not Available 4456421