Why light an elevator if no one's in it? Inefficiency of ventilation fans and cab lighting in elevators are now being addressed, thanks to proposed addendum df to Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings.
Proposed addendum df would require elevator cab lighting systems to have efficacy of not less than 35 lumens per watt. It would also require cab ventilation fans for elevators without air conditioning to not consume more than 0.7 W*s/L at maximum speed; when stopped and unoccupied, with the door closed for more than 15 minutes, cab interior lighting and ventilation would be de-energized until required again for operation. …
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