That was, in part, a council response to the austerity nonsense. In Horsham, some petty crime increased in local areas, but that wasn't unexpected given the reputations of those areas. And the least safe place is probably the park which is of a size that it is as dark as Dartmoor in the middle and most assaults are drink related and not exclusively female victims.
If Sarah Everard had disappeared from the middle of Clapham Common, then lighting may have been a concern, but as her last cctv footage shows, she was on a street well enough lit to clearly see all the colours of her clothes.
Swapping from sodium to LED in Horsham actually paid for itself in energy savings several times over, which is unusual for any council idea, let alone one that lasted a couple of years.
Turning off the lights isn't a new concept though, we lived in a so called dark village in the late eighties/early nineties. There were only three street lights in the whole village and two of them were on one estate.
Where we are now has no street lighting and, to date, the only issue we have had in 21 years is one attempted break in, and that was in broad daylight.