Can i colour it lighter?

Alot of hair color does fade fast !your haid dresser will have to do a 2step processing wich is remove t he old color and re tint with the color of your choice, Try not to use ash .ash colors have green base wich in most cases will turn your hair greyish green..you don't want that...if you think it will be to much of a change to go that all over you should try getting sliced or weaved carmel highlites(basically its the sandy color your looking for) hope this helped you out