Good quality material,long life,long lumen depreciation,easy to install Features:Good quality material--quartz glass,long life,long lumen depreciationLifetime:15000 hours turn on-off over 5000 timesVarious Shapes as you choose: U-shape,T-shape,Pen-shape,special shapeDiameter:3.5mm,5mm,6mm,7mm,according to your demandsWith(185nm) or without (254)ozoneApplication:water cheatment,sterilization,air ...