I figured other forums would be discussing this and found this post on ADVrider. I don’t have my helmet with me, but is the daytime warning stamped on the lens?
He is a snip from the post: (the guy analyzes the stuff like BDF)
I've read a few reviews elsewhere of other riders mentioning this reflection issue in dim light, so I know I'm not the only one. The rest here is for informational/discussion purposes, so if you don't care or aren't having any problems, you can skip this part, but for those of you interested, here's my theory...
I think what's happening here is the result of two reflections. it appears that the light is passing through the face shield and reflecting off of the insert. These "bright" spots are then reflecting back out toward the shield. Some of the light escapes through the shield, but because the inside of the shield is also glossy, a weaker version of the bright spot reflection reflects back into the rider's eyes. Due to the curvature of the shield and lens and the approach angle of the light, the ghosting typically appears toward the center line of the helmet shield. If you look at a light head on, you actually get two ghosts, one to either side of the light source.
The DAYTIME USE ONLY is clearly stamped on the clear lens insert as well as the smoke, so I'm guessing that Pinlock is aware of this issue and that this is the warning. This is their product, of course, and they can certainly govern its intended use, but personally, I bought this product to do away with shield fogging when it's the worst -- cold nights. I've kind of just traded one problem for another. It doesn't seem like it would take much in the way of design to make a version that works equally as well at night, too.
That said, I think I'd rather have ghosts than deal with fog and cold, so I'm still relatively happy with the purchase, but still, the problem can disappear with a small design change, and let's face it, this system isn't exactly cheap, so what's wrong with expecting the best in clarity?