I have the UV version of the X5T. I also have all the colored X5T's but the UV is my favorite. I have used it hunting to better see a blood trail. My Mom collects old glass and the light will show if the glass has been repaired. My 8 year old has used it to look for bugs at night (some glow really neat under UV). I have also used the light to check out a house a friend wanted to buy, (pet stains will show up under the UV light and any flaws in the walls of the home.
The biggest reason I bought this light is I use UV markers
to mark the PC equipment I sell, very handy with identifying parts I may or may not have sold.