A poorly maintenanced UV reflector exhibits the same signs or effects as a UV bulb that has surpassed its usable curing lifespan. A reflector is responsible for 60-70% of your UV systems curing power. Even if the reflector looks good to the human eye remember, your human eye cannot even see the UVA energy being used to cure your product. Your eye only sees visible light which is not used in the UV curing application. Rule of thumb is change out your reflectors at a minimum of every other lamp change.