Hi, I bought my exo terra 100 uvb bulb 13 watt 4 months ago, the pet store assistant told me that I only need to replace this bulb once per year, is this true? I'm kinda confused with this. And I have a type of turtle pellets that contain calcium phosphate, does this mean that I'm overdosing them with calcium? Or I don't need a uvb bulb anymore with such turtle pellet?
Here's how the bulb looks like:
