Welcome to AA. you can use Christmas tree led
light strings, but they would only be mood lights since Xmas tree lights are not very strong. If you have no intentions of any type of corals except the ones that do not use lights to supplement their food source it would be okay. It may look bright to the human eye but it really is not strong enough to grow corals...
PS: please take your computer keyboard off "Cap Lock" We know you are excited but no need to yell around here.lol