Playing with UV spectrum

For Christmas I got my wife a Nikon 1 converted to shoot full spectrum. That means all the blocking filters have been removed from in front of the sensor. the camera is now sensitive to the full range of spectrum, from around 310nm in the UV up to at least 900nm into the IR. The camera came back from Kolari Vision last weekend and have been trying it out. I bought a B+H 403 UV pass filter to try out. What I discovered was an image like this. Not what I expected. After a bit of digging I discovered that the 403 filter leaks IR light. So this image is actually a natural blend of UV and IR light. That's where the purple sky is coming from. I need to play around some more with this.