Thanks for the query.
It is ineffective for golden hair or grey hair or anything other than black. The simple reason is the target chromophore for the laser is melanin which is black. Otherwise laser hair removal is a good option and is relatively painless. You must understand it requires multiple sessions,may he 6 or more to achieve a desired result. Each session can be performed at gap of 1-2 months depending on rate of hair growth. Maintenance laser session like once every year may then be needed.