Some of the more interesting things you can see with an infrared luminance camera is clouds and plants, for a lot of small leafy plants you can see in the camera how healthy they are from much furthur distances than visable light, Equally I think I remember ripe mulberries having a very strong contrast compared to the plant.
For clouds, you can see the water that is not normally visible.
Slight downside is UV leakage, and you do need to refocus it, as the focal distance changes for different colors.