Since we are developing the Waylighter, I have a hypothesis that the flashlight and the assembly may be watertight. If that is proven, it opens up a whole world of possibilities... from flowing at the beach or near a river without fear of dropping it in the water, to flowing in rain, to perhaps even doing flow while partially in a lake or the ocean.
Here's what my testing plan is (the videos will be uploaded upon completion):
Water Submersion Test 1: The flashlight will be submerged in a container of water for a total of 15 minutes.
The results of this is that the flashlight survived in tact and without any signs of water intrusion.
Water Submersion Test 2: The flashlight will be installed in the blade assembly and the assembly will be sealed. The blade assembly will then be submerged in a sink containing water past the emitter of the hilt for a period of time (at least 10 minutes).
The result of this test is that the interior of the blade appears to be dry. For the purposes of this test it was undetermined if the little bit of moisture was from the pommel removal or moisture seeping in. No water droplets were observed on the inner surface of the blade as viewed from outside or looking down the interior of the blade from the bottom opening.
Water Submersion Test 3: The blade assembly will be taken to a body of water and put in (placed, dropped, or thrown...) the body of water to see what happens (float, sink, water intrusion at the pommel or tip...). The tip is glued and has a chair foot protector over it to help prevent fly-away tips which may help with preventing water intrusion.