我不是灯泡又怎么会亮
[wŏ bù shì dēng pào yòu zĕn me huì liàng]
It literally means 'How can I shine if I am not a light bulb?', which humorously suggests that one will not stand out or be noticed if one does not possess the corresponding qualities, or it may also reflect a sense of frustration or confusion when one's value or ability has not been recognized.