By the way Lunar weapons are supposed to work only when the 2 moons are on the sky, but they work any time disregarding the moons posiotions, so in the end its a double failure feature.
I've had them not work at times, despite being charged. Sometimes there's a moon out during the day (they don't orbit at the same speed).
The only thing bad about it is, without knowing how to make them yourself the only way to get the effect on anything better than steel weapons is to disenchant one and enchant it yourself on another. But unless you've been leveling your enchant skill, it won't be as powerful.
Its not a spoiler, its a confirmation of an unfinished feature.
I wouldn't be surprised if there is a way to do it, but we just haven't figured it out yet.