It could keep his mood light.

这可以让他心情轻松。

youdao

Listening to music can make me relaxed and keep my mood light.

听音乐可以使我放松，保持心情轻松。

youdao

And you're feeling like you're in a light mood. You've just passed a test.

但你觉得你想看点轻松的，因为你刚刚通过一门考试。

I feel like 课堂 - SpeakingMax英语口语达人

Are you the guy who keeps the team going on late nights by bringing coffee or helping to keep the mood light?

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The dialogue helps keep the mood light as character banter flows naturally and feels like what it is -- conversations between people who don't take themselves too seriously but have experienced life-changing events.

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It would not have mattered much if the playing had been third rate, so cool was the evening, so light the mood.

NEWYORKER: The Olympian