What is flaring or mushrooming and when would I do it?
Flaring the end of the fiber will give it a wider viewing angle. This technique is popular when installing a star ceiling. Flaring random fibers can add a bit of variety, helping to create the illusion that some of the stars are closer than others.
This is how you can easily flare or mushroom the end of the fiber optic filament.
By holding it close to the tip of a hot soldering iron. Be careful NOT to touch the fiber to the end.
Flaring fiber optic fibers can also be done with a candle as shown in the photos. Of course, you’ll want to use caution ANY time you work with an open flame!