[Skunkworks] Offtopic Traffic lights LEDs vs bulbs

Hi folks, First i have to apologize for this offtopic thread!. About an hour ago i saw a technician replacing what appears to me as a screw-on ordinary domestic bulb on the traffic lights at the GPO intersection. I have to say in an time where power savings are important and durability is critical - was the cost of implementing LED based traffic lights far too expensive compared to the frequent replacement of bulbs and higher power costs?. Just curious as to why we opt for ancient technology all the time. Have a pleasant day and weekend. Mich