《宋史·本纪·卷十七》
当初，太子东宫中常有红光环绕，到这时红光更加炽烈如火。
初，太子宫中常有赤光，至是光益炽如火。
At first, there was often a red light around the East Palace of the Crown Prince, and by this time the red light was even more intense, like fire.