If you're familiar with dark sky lighting requirements, you're halfway there. Turtle Friendly Lighting goes beyond "dark sky" lighting requirements in that it also speaks to the type of light produced by your fixture as well as the way your fixture is mounted.
Turtle Friendly Lighting has 3 principles:
Keep It Shielded - Also a dark sky principle - All light is directed down to the ground
Keep It Long - Use only long wavelength "turtle friendly" light bulbs
Keep It Low - Lower mounting heights are less likely to invade critical turtle nesting areas
All of the full cutoff lights featured in this section may be combined with special turtle friendly bulbs for the ultimate in turtle friendly lighting. The combination of full cutoff optics and "turtle friendly" light output has been proven to be the least disruptive outdoor lighting solution for sensitive turtle nesting areas.