A surface on one side of the wiring board is {HEAD ~ a device forming surface} including {TAIL ~ the plurality} of the LED chip groups, an external connecting terminal for leading out electrodes, and a wiring pattern for electrical connection between the LED chip groups and the external connecting terminal 
A surface on one side of the wiring board is { HEAD ~ a device forming surface } including { TAIL ~ the plurality } of the LED chip groups , an external connecting terminal for leading out electrodes , and a wiring pattern for electrical connection between the LED chip groups and the external connecting terminal
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