I currently am using that. Not that specific size of bulb. I have a 30 gal tank (planted) and it gives off 3.2 wpg. Expensive, but worth it in my opinion. As for the lunar light well, the fixture i have only has one lunar light. I read in the advertisement that your light fixture has two, so hopefully its better then mine, because mine might as well not be there, i barely am able to see it.