The design for three different kinds of LED fire horns are available for download on Thingiverse. They're hollow so you can fit a strip of LEDs inside to light them up.
Lyndsey Gilpin has nothing to disclose. She doesn't hold investments in the technology companies she covers.
Lyndsey Gilpin is a former Staff Writer for TechRepublic, covering sustainability and entrepreneurship. She's co-author of the book Follow the Geeks.