I only light up when cameras are flashing

闪光灯亮起时我才能看到光芒

light up照亮； 点烟； 开街灯或车灯； （使）变得喜悦

例句：

You should see his eyes light up when he talks about home.

你真该看看他谈到家的时候眼睛放光的模样。

Tom will really light up when he sees his new bike.

汤姆看见他的新脚踏车时,一定十分高兴.

She was relieved to see his face light up with a boyish grin.

看到他脸上现出孩子气的笑容，她总算松了口气。

Even if it might be something you regret

即使你会因此抱憾惋惜

Even if即使，纵然； 虽然； 即若； 哪怕

例句：

Friendship means understanding, not agreement. It means forgiveness, not forgetting.It means the memories last, even if contact is lost.

友情是理解，不是妥协；是原谅，不是遗忘。即使不联系，感情依然在。

Even if the amendment is passed it can be defeated judicially.

即使修正案获得通过，也有可能通过司法途径被废除。

Even if the weather's awful there's lots to do.

即使天气很差，也还有好多事情可做。