Uv sterilizer aquaclear bulb life?

[Notsolostfish]

Iv changed my uv sterilizer bulb probably around 1 year ago, i run 57w 24/7. And i noticed its no longer working. Its behind my tank. I dont always check on it. Id that normal for bulbs to just burn out? Flow on it is the same runnint it on vectra s2 seperate loop

 

[lapin]

UV bulbs usually don’t burn out because people should be changing then every year. The light loses brightness over time.
I would replace the bulb first. If thats not it then it could be the ballast or starter.