It is surprisingly bright and the colors are beautiful. It is a well-known fact that blue lights last longer than others. I got two masks. The one that used blue light lasted longer than four hours. For the one that did not use blue lights lasted less than four hours.
Premium Infinity LED Color Changing Luminous Fiber Optic Surgical Half Mask
My kid loved his mask.
I really love it! The only thing I noticed is that the lighting and the seamwork are a little uneven. There is more area lit up one side than there is on the other, although it still looks great in the dark. The slightly off center seam affects fitment but only a tiny bit, I have adjusted to it where it is barely noticeable when viewing. Still an awesome mask!