有没有let+ something + adj这个词组呢？不要在网上查哦 ..

没有，
let something/someone 后面必须跟动词一般时态。

let something/someone do something.

只有let sb do/not do
但有 make sb/sth adj 如 you make me happy

there is not verb in the sentence, so it's not right

可以是let sth. be + adj.