Philips LED T12 retrofit
-can be had in versions for magnetic ballast or electronic-they work great and are T8 diameter.High pressure sodium lamps are dramaticly superior to LED for roadway lighting-a local overpass/intersection was recently completed and the builder had enough sense to use HPS-insuring proper,effective and safe illumination.Back to "good"use of LEDs,noticed Feit has some big globe"retro"LED bulbs that have a helical"filament"of phosphor coated strip LEDs-so far have hot ben able to get myself to spend $35 on something made in china,but is tempting to try one out.