expression
coolness of distant lights on a summer night
A poetic seasonal expression (kigo) for summer, evoking the refreshing feeling of seeing twinkling lights in the distance on a warm evening. Rare in everyday conversation; mostly encountered in haiku or literary contexts.
灯涼しという季語は、夏の夜の遠くの灯りが涼しげに見える様子を表す。
The seasonal word 灯涼し describes how distant lights look cool on a summer night.
Compound of 灯 (hi, 'light') and 涼し (suzushi, 'cool'). The exact historical derivation is uncertain, but it is a classical poetic coinage used as a summer kigo.