For indoor lighting, LED lamps are indeed the right solution.
I have also been using for more than a decade 13 W LED lamps that produce the same luminous flux as the 100-W incandescent lamps or the 23-W compact fluorescent lamps used in the past.
However, the requirements for an outdoor night lamp are very different. Low-pressure sodium lamps have about the same energy efficiency and lifetime as LED lamps, so those are not arguments for replacing them. The only thing that matters is whether you prefer yellow light or white light in a night environment. I definitely prefer yellow light, for reasons already mentioned by others, i.e. much less interference with night vision, sky light, nocturnal animals, or with my street-directed windows at home.
If energy efficiency would really matter, one could produce monochromatic amber LED lamps with efficiencies at least double over the current white LED lamps.
I have also been using for more than a decade 13 W LED lamps that produce the same luminous flux as the 100-W incandescent lamps or the 23-W compact fluorescent lamps used in the past.
However, the requirements for an outdoor night lamp are very different. Low-pressure sodium lamps have about the same energy efficiency and lifetime as LED lamps, so those are not arguments for replacing them. The only thing that matters is whether you prefer yellow light or white light in a night environment. I definitely prefer yellow light, for reasons already mentioned by others, i.e. much less interference with night vision, sky light, nocturnal animals, or with my street-directed windows at home.
If energy efficiency would really matter, one could produce monochromatic amber LED lamps with efficiencies at least double over the current white LED lamps.