Assertion: aperture lamp | /r/HasAspect | clear break
Facets:
value: to concentrate light
type: PURPOSE
value: in the phosphor coating
type: LOCATION
value: of 30°
type: OTHER
Source sentences:
text: Aperture lamps have a clear break in the phosphor coating, typically of 30°, to concentrate light in one direction and provide higher brightness in the beam than can be achieved by uniform phosphor coatings.