To be TURTLE-SAFE, it needs to have the specific 560 NM LED lamp. The visor (optional), helps to reduce the light glare from higher stories. Our fixture is minimally disruptive to nesting turtles and recommended for use along nesting beaches, also it comes with an amber and a clear lens for off turtle seasons. Hood dimensions are 2 3/4" x 7 1/2", no visor, 2 3/4" x 10 1/8" w/visor.