If I buy a led fixture that has 60 degree lenses, can I just remove them to have a fixture that will give a 120 degree view? First time using leds and I wanted to try out the Chinese black box, but wanted to use 1 on a 40 breeder, a 60 degree lens is just too narrow so I am told, without placing it unreasonably high, would a led fixture this size with a 90 degree lens be adequate?