Assertion: blue led | /r/HasProperty | expensive
Facets:
value: compared to the more common reds
type: OTHER
value: relatively
type: DEGREE
Source sentences:
text: Ultraviolet and blue LEDs are relatively expensive compared to the more common reds, greens, yellows and infrareds and are thus less commonly used in commercial applications.
text: But the color of the light emitted actually depends on the material used in the PN junction (which is why blue LEDs are so expensive - they are made from rare materials).