Patent ID: 9241383
Filing Date: 2016-01-19
CPC Classification: F21K,H01L,H05B

Claim Text:
1. A light-emitting device comprising: a first light-emitting area including a first light-emitting block that comprises first light-emitting elements electrically connected in series to one another and a second light-emitting block that comprises second light-emitting elements electrically connected in series to one another; a first circuit substrate, the first light-emitting elements and the second light-emitting elements of the first light-emitting area being mounted on the first circuit substrate; a second light-emitting area including a first light-emitting block that comprises first light-emitting elements electrically connected in series to one another and a second light-emitting block that comprises second light-emitting elements electrically connected in series to one another; a second circuit substrate, the first light-emitting elements and the second light-emitting elements of the second light-emitting area being disposed on the second circuit substrate; a third light-emitting area including a first light-emitting block that comprises first light-emitting elements electrically connected in series to one another and a second light-emitting block that comprises second light-emitting elements electrically connected in series to one another; and a third circuit substrate, the first light-emitting elements and the second light-emitting elements of the third light-emitting area being disposed on the third circuit substrate, wherein the first light-emitting elements are configured to start to emit light with a voltage that is switched to apply to the first light-emitting elements by a control circuit when the voltage originating from an alternate current of a power source reaches a first voltage value, and the second light-emitting elements are configured to start to emit light with the voltage that is switched to apply to both of the first light-emitting elements and the second light-emitting elements by the control circuit while the voltage originating from the alternate current of the power source reaches and surpasses a second voltage value that is higher than the first voltage value.