Continuous electrical power source in switched (non-continuous) artificial lighting environments

A continuous electrical power supply apparatus for providing uninterrupted power to an electrical load from a periodically switched intermittent power source, comprising:

• an electrical energy storage device;
• an electrical energy storage device charger configured to receive electrical power from the intermittent power source and to charge the electrical energy storage device during periods when the intermittent power source is energized;
• an output power circuit configured to supply electrical power from the electrical energy storage device to the electrical load when the intermittent power source is or is not energized;
• and
• an enclosure housing the electrical energy storage device, electrical energy storage device charger, and output power circuit;
• wherein the battery is sized to power the electrical load during periods when the intermittent power source is de-energized, and
• wherein the electrical energy storage device charger is configured to recharge the electrical energy storage device during a limited charging window corresponding to the energized period of the intermittent power source such that the electrical load receives substantially continuous electrical power.