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A LED Exit sign of Electrozen in the storage of Carmel hospital
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It is available with either green or white (Here) LEDs, but the sign always colored green.
You can see how dim it is (This picture, show it in the day of its installation), relative to a hypothetical green version of the Canadian common incandescent EXIT/SORTIE sign.
Despite this, it is still visible in the darkness (It have an emergency battery of NiCd for operating the sign during a power interruption for 3 hours).
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And the incandescent exit signs aren't even made in Canada anymore everything is LED now but the incandescents still have a certain charm to them.