The National Electrical Manufacturers Association (NEMA) published NEMA LSD 73-2015, Energy Savings with Fluorescent and LED Dimming.
This new white paper describes the signal path from the user control input through the control wiring, ballast or driver, and lamp or LED module. It also explains factors that affect energy consumption and savings, efficacy and user experience at each stage.
NEMA LSD 73-2015 was developed by the Ballast and Drivers Section and the Lighting Controls Section. It discusses the relationship between the control input voltage and overall energy consumed by these ballasts and drivers.
NEMA LSD 73-2015 may be downloaded free here.