Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I loved this light- until...

I have 4 of these lights. I was in love with them and bought two more at the end of last year. Then two lights, both almost 4 years old, suddenly went dead within a couple months of each other. The ballasts went bad right around the same time, and the replacement part recently doubled to about $60.After contacting Coralife twice, I have yet to hear from them. I'm suspecting that the ballasts are designed to go out every few years.