| 摘要 |
PROBLEM TO BE SOLVED: To provide a luminaire which excels in energy efficiency.SOLUTION: A luminaire a1 includes: a plurality of LED chips 31 arranged on a substrate; a plurality of groups 31A which respectively include a parallel circuit in which at least two out of the plurality of LED chips 31 are connected in parallel with each other; and a power supply unit 60 for supplying an electric current to the plurality of groups 31A. Anodes of LED chips 31 belonging to each of the groups 31A are electrically connected directly with each other, and cathodes of LED chips 31 belonging to each of the groups 31A are electrically connected directly with each other. The number of LED chips 31 of each of the groups 31A is selected in such a manner that a driving current for one piece of LED chip becomes equal to or less than 40% of a rated current of the LED chip.SELECTED DRAWING: Figure 10 |
