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Keep 1 or 2 as historic items, replace the rest
In this case i think they'll keep all of them but replace the gas mantels with retrofit modern LED that's been packaged to look authentical. Given the length of time they've survived they've been great in terms of waste materials (i get asked to look at redoing a lot of lighting schemes that are less than 10 years old with no decent recycling policies). But yes offsetting the energy usage isn't sustainable.
One thing to consider is how wonderfully pants gas lanterns are in terms of output and anything LED is going to be a lot brighter. The city is already way too bright and too many new schemes fall painfully short of addressing this.
jono84
Is not a sustainable solution..
Keep 1 or 2 as historic items, replace the rest.