the ballast that run them go caboom in less than a year watt is more planit frendly : having 2 replace a streetlight evry year or stick a MV streetlight with a good MV lamp and not have 2 tuch it for the next 40 years
its the ballasts that die. well I know you can not get probe start MH streetlights eny more but the PSMH ballasts from 175-1000W are the same as Probe start ballast ecsept they have an ignitor so you can get a PSMH streetlight remove the ignitore and run an MV lamp
Sure you can, but no area is going to be converting all of their streetlights to mercury, that is the reason I would prefer CMH. You can also get magnetic ballasted CMH which would work better and last longer.