How much for one time of laser hair removal of GentleLase? What the difference between this GentleLase laser and other 彩光?

Different part has different price for hair removal. Let’s say under arm, special offer $3880/8times.
Gentlelase is a laser with 755nm wavelength, and彩光is IPL (intensive pulse light). Gentlelase is more effective comparing with other way for hair removal, casued GentleLase can remove most of the hair within 6-8 times and even some fine hair(細小毛發), but IPL can only remove some thick hair and take longer time (more than 12 times).