| http://www.w3.org/ns/prov#value | - In this instance where three light emitting elements, for example, first second and third light emitting elements, are employed, one of the three light emitting elements, for example, the first light emitting element, is normally used and, if occurrence of a regular reflection condition is detected during use of the first light emitting element, the light emitting element to be used is changed ove
|
