@niall i'd Rather have HPS over LED yes (For streetlights anyway) i've seen LED installations and usually the color is better but the illumination is much dimmer than the original lighting.
Ceramic Metal Halide is better IMO...than say....traditional quartz MH,and it seems like a Viable Option,but so does induction....
Ummm Niall I have some HPS that was in service for 20 years and removed from service and given to me, still working...I have one from 1977....its a base down only HPS....and my first HPS lamp in collection was from a fallen posttop and had more than 8 years of service plus I also have another lamp that was installed the same time as the one from fallen posttop, except it was in service for 10 years instead and still working, I got that one from my former's house street...(the court where I used to live). Those 2 latter HPS lamps were Philips from 1997.....before ALTOs.......athough I have some ALTOs that made it more than 5 to 7 years....
I have a lot of used HID lamps used from different streetlights....
I have some more used HPS lamps that has lasted really long.....the only thing I have never really seen is really long used MH lamps....
Icetrons for electric companies who's terrible in maintaining streetlights......
CMH for good and fast streetlight maintaining companies!
Ceramic Metal Halide is better IMO...than say....traditional quartz MH,and it seems like a Viable Option,but so does induction....
I have a lot of used HID lamps used from different streetlights....
I have some more used HPS lamps that has lasted really long.....the only thing I have never really seen is really long used MH lamps....