Simplify the following text for a Grade 6 native English-speaking person.
Original: Tungsten 's many alloys have numerous applications , most notably in incandescent light bulb filaments , X-ray tubes ( as both the filament and target ) , and superalloys .
Simplified: Their most well known use is in light bulb filaments . It is also used as the filament and target in most X-ray tubes and also in superalloys .