High pressure sodium is very common and still available. Low pressure sodium is extinct. The last LPS lamp was made in 2018 I believe.
It's a shame, because LPS was the gold standard for astronomy as the hyperspecific emission spectrum made it extremely easy to filter out for astrophotographers and telescope users
It's a shame, because LPS was the gold standard for astronomy as the hyperspecific emission spectrum made it extremely easy to filter out for astrophotographers and telescope users