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Good Exit Sign Lamps
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The local TrueValue has a few boxes of these. I got this ten-pack of 15W T6 incandescent lamps for less than $2 yesterday. I figured these would make decent exit sign lamps and was correct. My exit sign is fairly bright with these, but not as bright as with the 9W PL retrofit kit installed, which is what's installed. You can see the lamp is a little tanned around the filament area. They were all like that but I assume it was just from factory testing.
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As for the tanned part, I guess it is the vacuum coated with Triphosphorus pentanitride to clean up remaining residue.