LEDs seem to be the light of choice at the moment because they are cheap.
LEDs are
not cheap - they are generally more expensive to install (capital) but cheaper to run (revenue/CO2/carbon) and last a lot longer than traditional lighting (reduced maintenance costs). The long-term advantages outweigh the initial costs!
On a separate note, offshore wind farms are lit at all extremities of the plot - may be more to do with ships than aircraft, although the lights are higher than where sailors would generally look! I'd suggest they'll notice them on their radars & charts first!
