| 摘要 |
A lighting device has a lighting unit and a housing unit. The lighting unit includes a light source unit and a heat sink. The light source unit has a light source. The heat sink supports the light source unit. The heat sink has at least one open groove that allows air to flow between an inside of the lighting unit and an outside of the lighting unit. The housing unit houses at least a part of the lighting unit to support the lighting unit.
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