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In my experience, the 4 and 7 watters made in the last 30 years or so are very short lived.
The original 10 watters used in the 'Exit' signs in my building, installed in the 1960s, lasted a good 20 years before they started burning out. The only replacements available were the 4 and 7 watters, which required constant replacement until I finally got rid of them recently and put in LED retrofits.
And BTW, before somebody hollers, I did not run the 'Exit' signs at half power. I ran a single bulb with a diode to test how long it would last, and it burned out almost as fast as without a diode.
Last edited by old_coot88; 04-11-2016 at 10:36 PM.
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