Some follow up on a previously mentioned issue with the LR4 lights:
Justin,
I ride in the rain. I noticed the other day that I got a lot of condensation behind the lens. I haven't tried taking these apart to see if their is O-ring or something behind the bezel. Is their supposed to be? They are advertised as IPX7.
I noticed the same thing on mine, but only on one side. I'm going to take mine apart and grease the o-ring (yeah, there is one) with silcone grease and see if it will seal up better. If that doesn't cut it, next will be silicone sealant.
Yup, it's a simple o-ring seal behind the front bezel. Our latest batches are using a thicker diameter ring on that seal. If you're having a problem with fogging, please send me a message and we'll get you sorted out.
I had PMed Justin and he kindly sent me out 4 new black rubber o-rings, (though there are only 2 required) to replace the two green colored original o-rings. Looking at the rings I did not see that they looked all that much thicker, but just said, what the heck... silicone greased them up and installed them.
Unfortunately, the new o-rings did not better that the originals, and during our 2 week Ride to the Divide both of the lights were fully fogged up. Still put out plenty of light through the moisture, but I don't think it would be good for the long term health of the electronics. I didn't want to be messing them up while out on the road, so I waited until I got home and took them apart yesterday, intending on goobering them up with some silicone sealer.
But, when I had the lenses in hand I came up with a better idea that may be a "best practice" for you all. First thing that I noticed was that the total diameter of the o-rings was just a tad too small, which had made it difficult to keep them in the little groove when re-assembling. On a whim, I tried just stretching the o-ring out a little and that did seem to make a big difference in getting it properly seated. With the o-ring in place in its groove of the lens cap, I dropped the clear plastic lens on top of it, then put a second pre-stretched o-ring on top of the lens. The second ring will contact the edge of the silver reflector and help push the clear lens into the outermost o-ring.
Having the rings silicone greased and assembling carefully everything stayed in place and the pressure against the outer most o-ring is much improved. I'm fairly confident that this will completely solve the moisture leakage.
Just wanted to share the idea in case you run into the same thing.