NEC 700.16 Emergency Illumination

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IMFOTP

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Code says

"emergency lighting systems shall be designed and installed so that the failure of any individual lighting element, such as the burning out of a lamp, cannot leave in total darkness any space that requires emergency illumination."

I was hoping someone could define the term "individual lighting element". Obviously "lamp" is one. Wouldn't ballast be one? Should an exterior fixture over an exit door be installed with dual lamps and dual ballast? What about a battery pack? When it is installed in a fixture is it not a lighting element? Do we need two battery packs?
 
Personally, I think "lighting element" is only the part that converts the electrical energy to light. That would be a lamp (incandescent, fluorescent, or MH, etc.) or now it could be an LED.

So for the exterior light fixture, I think it only needs two lamps. Not two ballasts.
 
i forget where it was but for one interior and exterior egress lighting have different rules. the one your refering two states the fixture needs a minimum of "2" lamps 6 watts minimum.
 
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