It says a year but this is what ive been told to change it every 6 months for better results. Just what I hear so not a fact ive proven just what ive been told maybe someone can elaborate on it more GL.
I actually called them today & they gave me the contact info for the manufacturer & they're shipping a replacement.
It was actually a Exo Terra Sun Glo 100 Watt Neodymium bulb