老公你为什么会发光呐因为要把老婆你照亮呐
[lăo gōng nĭ wéi shén me huì fā guāng nà yīn wéi yào bă lăo pó nĭ zhào liàng nà]
This playful nickname expresses a loving sentiment where one partner believes their significant other 'shines' to guide or brighten their way, suggesting the person brings light into their life.