Lei Kwang-hsia (Summer Lei, Chinese: 雷光夏); 15 August 1968) is a musician.

She has released several solo albums, including "I am Lei Kwang-hsia" (Mandarin: 我是雷光夏), "Cheeks to the Moon" (Mandarin: 臉頰貼緊月球), "Secret Words Of Time" (Mandarin: 時間的密語), "Fad Away 2003" (Mandarin: 2003逝), and "the Light of Darkness" (黑暗之光).

In late December 2015, Lei composed "Travel" for the Taipei MRT Red Line (Tamshui-Xinyi), and created entrance music for each of the four high-capacity routes of the Taipei Metro for the third part of the "Taipei Soundscape Monthly Project".

Lei has won the Taiwan Golden Melody Award several times. In 2010, she won the Best Original Song for Movie at the Taiwan Golden Horse Awards for the movie "Taipei Exchanges" (Mandarin: 第36個故事), and in 2011, she won the Best Album Producer in the Performance category at the Golden Melody Awards. She has also been a finalist for the Golden Horse Awards, Golden Melody Awards, and Golden Bell Awards.