你的光i是我唯一的亮
[nĭ de guāng i shì wŏ wéi yī de liàng]
Expresses the idea that the only source of brightness or joy comes from someone's 'light'. Here 'i' could also hint at personal adoration (me/love) in modern net slang, making it more intimate like: Your light is my (true/only) bright side.