明るさ

(1)having abundant light or illumination; "they played as long as it was light"; "as long as the lighting was good"

(2)十分な光もしくは照明があること

(3)the location of a visual perception along a continuum from black to white

(4)黒から白へと連続した視覚の配置

(5)a gay feeling

(6)楽しい気持ち

(7)having a light color

(8)明るい色であること