The hex color #1fff00 is a light color. The web-safe version is Hex
#33FF00. A complementary color is
#E000FF. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#52FF33, and Hex
#00CC00 is the 20% darker color. If the color is saturated by 10%, you get
#19FF00. If the color is desaturated by 10%, the color
#25EF0A is obtained.