FIG. 20 illustrates another embodiment of an integrated dimming LED driver and battery backup system, but in a single-stage variation (a single regulator stage rather than voltage and then current regulating stages). Here, a voltage regulator circuit/voltage to current converter 2007, with a master controller 2090, converts a rectified DC voltage, V1, to a regulated LED current, I1. The regulated LED current, I1, can either be directed entirely to the one or more LEDs 2004, or can be partially directed to the one or more LEDs 2004, and partially directed to the energy storage management system 2010. The master controller 2090 can monitor and control this balance. In another embodiment, the regulated LED current, I1, can be entirely directed to the energy storage management system 2010. The energy storage management system 2010 can absorb charging current, I3, if available, and charge an energy storage device 2008. The energy storage management system 2010 can also provide power from the energy storage device 2008 to the one or more LEDs 2004 via current, I2, at the behest of the master controller 2090. As such, a first regulated LED current, I1, from the AC mains 2005 can be combined with the second regulated LED current, I2, from the energy storage device 2008 to form a combined regulated LED current, I1+I2, that drives the one or more LEDs 2004. In some instances, the voltage regulator circuit/voltage to current converter 2007, via instruction from the master controller 2090, can adjust the balance between I2 and I1. In yet other instances, both the energy storage management system 2010 and the voltage regulator circuit/voltage to current converter 2007 can work in combination, via instruction from the master controller 2090, to adjust the balance between I2 and I1.
