| 摘要 |
PROBLEM TO BE SOLVED: To attain a light weight, an improved heat radiation performance and an improved airtight performance. SOLUTION: This is a multi-light color signal having three-two signal light sources 8 incorporated in one light box 2, wherein the box 2 is formed in an airtight structure of light alloy material excellent in heat radiation performance, a power transformer 9 being a main heat radiation part and the light sources 8 are fixed to the box 2 so as to enable transmission of heat, and the whole box 2 is used as a heat radiator.
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