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

摘要

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.

主权项

1. A light-emitting device, comprising:
a first light-emitting element including a first light-emitting diode, and configured to emit a first spectrum; and a second light-emitting element including a second light-emitting diode and a constant voltage element connected in series to the second light-emitting diode, the second light-emitting element configured to emit a second spectrum different from the first spectrum and connected in parallel to the first light-emitting element, wherein a line indicating a relation between a forward-current and a forward-voltage of the first light-emitting element crosses with a line indicating a relation between a forward-current and a forward-voltage of the second light-emitting element.