Electric lighting system with removably couplable power device

An electric lighting system comprising:

• a plurality of lighting devices comprising:
• a first lighting device having a first shape, the first lighting device comprising a first housing including a first lighting element and a first power device holding portion, the first power device holding portion comprising a first universally sized and shaped cavity;
• and
• a second lighting device having a second shape, the second lighting device comprising a second housing including a second lighting element and a second power device holding portion, the second power device holding portion comprising a second universally sized and shaped cavity;
• and
• a universally sized and shaped power device comprising a coupling component, wherein:
• the power device is operable to be inserted into the first universally sized and shaped cavity when the first lighting device is lowered onto the power device;
• the power device is operable to be inserted into the second universally sized and shaped cavity when the second lighting device is lowered onto the power device, the power device;
• the coupling component is removably couplable to the first power device holding portion such that a first electrical communication is established when the power device is inserted into the first universally sized and shaped cavity at any rotational position relative to the first lighting device about a first shared central axis;
• and
• the coupling component is removably couplable to the second power device holding portion such that a second electrical communication is established when the power device is inserted into the second universally sized and shaped cavity at any rotational position relative to the second lighting device about a second shared central axis.