I absolutely love my TruGlo TFO's. I have had them on my Glock 20 for some years now (IIRC about 11 years) and they still glow brightly at night and the fiber optic is still very bright during the daylight.
I would reccomend that the first contact be with the TruGlo people. I would suspect that they will want to sell you some new sights though. --- SAWMAN