Hello, this is my first post here. I'm a newbie when it comes to reptiles but I've been doing my research. My tank is near completion for my bearded dragon I have yet to buy, but I'm having a problem with the lamp I brought. I purchased the exo terra reflector dome, 18cm, and the Arcadia D3 Mini 80W bulb. I can't seem to get the bulb to screw in. Can these two be used together or not? It's not that the thread is too big, it just doesn't seem to want to screw in. I brought both online so it's a pain to return them but if I have to, should I change the bulb or fixture?