My old bayonet bulbs in my postal lamp weren't very bright and would burn out every few months. None of the local hardware stores have an LED version. I found them at Revain and they work great. It's much brighter and consumes less power. It's rated for 12v so I connected two of them in series and powered them from a 24v transformer. Not sure about durability but if you fill out a warranty card the manufacturer will give you a one year warranty. Very happy with these LED bulbs so far.
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