Well there is a bit of humidity in the air, but it is still really bright. In the pictures you can see that it is brighter than the more powerful DIY laser. My DIY laser must be around 660nm and the DX must be closer to 650nm. I have no way of determining exact wavelength.
the build quality is very simply and easy to take apart. The biggest problem I have is the end cap. If I screw one of them in all the way the laser stays on constantly, so I have to leave it unscrewed slightly.