The bulbs in the traffic lights themselves are smaller than
you'd think considering the diameter of the 'light', the front lens does
a really good job of refracting and magnifying the bulb's light. I still
think it'd take months and months and months to recover the CO2 emitted
while replacing every bulb, if not at least a year - when by that time,
the bulb may have quite possibly burnt itself out anyway requiring a
simple one- or two-man swapout instead of a massive operation.

Indeed some street lights just work off normal looking household bulbs -
admitedly the larger round ball ones.
 
Although there is a street near me with some very old street lights that
have bog standard normal bulbs, with little mirror mosaicss to reflect
the light.  Alas they don't actually work...    
 

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