ASHRAE 90.1 2010 9.4.1.2 Space Control states: 

"Each space enclosed by ceiling height partitions shall have at least one control device to independently control the general lighting within the space. Each manual device shall be readily accessible and located so the occupants can see the controlled lighting. All controlled lighting shall meet the following requirements:

The controlled lighting shall have at least one control step between 30% and 70% (inclusive) of full lighting power in addition to all off."

For projects outside the US is this required ?

If you are using occupancy control and daylight harvesting does this comply by itself ? 

Any feedback on the requirement to include this for lighting designs would be very useful. 

Thanks.