As it says in the title, this is the UV grenade from Blade 2. I've left plenty of space inside so it can be fitted with LEDs. I fitted mine with some cool white LEDs I bought from Amazon, although you could totally cannibalize battery powered fairy lights.
You will need to print:
*B2UV_Dome.stl and B2UV_Disc.stl are best printed in a transparent material.
I designed this so it can be printed without supports, although you may get a cleaner print off the top piece if you use them.