Quote:
Originally Posted by old_coot88
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.
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My job, as an electrician on second shift was to do exit lite maintenance. Lamp life was highly dependant on how well the filament was supported, which is true with just about any incandescent lamp. They used to buy 130 volt lamps. Some signs used low wattage fluorescent lamps.
At the end, we installed LED signs with ni-cad battery backup. That's the kind, I have in my two buildings.
