Light-emitting device, and light source for lighting and lighting apparatus using the same

Abstract

A light-emitting device includes a first light-emitting element and a second light-emitting element. The first light-emitting element has a first LED, and emits a first spectrum. The second light-emitting element has a second LED and a constant voltage element connected in series, and emits a second spectrum different from the first spectrum. The second light-emitting element is connected in parallel to the first light-emitting element. First light-emitting element and the second light-emitting element are configured such that their lines indicating the forward current-forward voltage characteristics cross each other. This enables to change spectral distribution emitted from the light-emitting device just by changing power supplied from a single power circuit.

Dependencies are inferred from the claim text.