"light purple" is correct and usable in written English.
You can use it to describe the shade of a color. For example, "She had light purple eyes that were almost lavender."
Shrubs 0.5 m tall; flowers light purple; leaves dull gray.
The snow was falling straight down so that the air seemed both white and light purple.
Standing outside on the balcony, Elena's hair shimmers from light blue to light purple.
White, for example, is very weak (and actually light purple, not white).
Shrub ca. 80 cm tall; ligules light purple; disc florets yellow.
Shrub ca. 0.5 m tall; corolla light purple, base of lobes with pink spot.
I tried on a light purple Roosevelt, a classic button-down with a chest pocket.
She used similar flooring in the bathroom, and painted the walls a light purple.
Instead of a light purple theme, this Vaio has more of silver matte look.
Yumi Kim incorporates a flattering light purple color to this feminine design.
There are light purple flowers growing in between the olive trees, rocks and brown grass.
