The hex color #b5e20c is a light color. The web-safe version is Hex
#CCCC00. A complementary color is
#4A1DF3. The grayscale version is
#8C8C8C. A 20% lighter version of the original color is
#E8FF3F, and Hex
#82AF00 is the 20% darker color. If the color is saturated by 10%, you get
#B9EB00. If the color is desaturated by 10%, the color
#B1D919 is obtained.