Adjustable electrical apparatus with hangar bars for installation in a building

A lighting system, comprising:

• a housing structure including:
• a front end face;
• a rear face;
• a sidewall having at least one exterior width dimension such that at least a portion of the sidewall fits into a space having a width of less than 3.5 inches;
• and
• at least one flange or lip that extends laterally outward from the sidewall and surrounds at least a portion of the front end face, the at least one flange or lip including at least one first feature forming a twist and lock mechanism to couple a trim to the front end face of the housing structure;
• a light source module inside the housing structure;
• a reflecting element inside the housing structure to direct light produced by the light source module out of the housing structure and into an area surrounding the lighting system;
• and
• an AC to DC converter, positioned proximate to the rear face of the housing structure, to power the light source module, the AC to DC converter being insulated from the housing structure and coupled to the housing structure using a connecting mechanism.

A lighting apparatus, comprising:

• a housing structure comprising:
• an interior cavity having a rear wall and a front aperture;
• a sidewall surrounding the interior cavity and having at least one exterior width dimension such that at least a portion of the sidewall fits into a space having a width of less than 3.5 inches;
• and
• a front end face coupled to the sidewall and surrounding the front aperture of the interior cavity, the front end face including at least one first feature forming a twist and lock mechanism to couple a trim to the front end face of the housing structure;
• a light source module positioned inside the interior cavity of the housing structure, the light source module being thermally coupled to the rear wall of the interior cavity and including at least one LED;
• a reflecting element inside the housing structure to direct light produced by the light source module out of the housing structure;
• a substantially flat lens having a front surface, wherein at least a portion of the front surface of the lens is substantially coplanar with an exterior surface of the front end face of the housing structure;
• an AC to DC converter to power the light source module, the AC to DC converter being insulated from the housing structure and coupled to the housing structure using a connecting mechanism;
• and
• an electrically insulating plastic or polycarbonate cup to contain the AC to DC converter.

A lighting system, comprising:

• a metal or metal alloy housing structure comprising:
• an interior cavity having a rear wall and a front aperture;
• a sidewall surrounding the interior cavity and having at least one exterior width dimension such that at least a portion of the sidewall fits into a space having a width of less than 3.5 inches;
• and
• a front end face coupled to the sidewall and surrounding the front aperture of the interior cavity, the front end face including at least one first feature forming a twist and lock mechanism to couple a trim to the front end face of the housing structure;
• a light source module positioned inside the interior cavity of the housing structure, the light source module being thermally coupled to the rear wall of the interior cavity and including at least one LED;
• a reflecting element inside the housing structure to direct light produced by the light source module out of the housing structure;
• a substantially flat lens having a front surface, wherein at least a portion of the front surface of the lens is substantially coplanar with an exterior surface of the front end face of the housing structure;
• an AC to DC converter to power the light source module, the AC to DC converter being insulated from the housing structure and coupled to the housing structure using a connecting mechanism;
• an electrically insulating plastic or polycarbonate cup to contain the AC to DC converter;
• and
• a pair of complimentary keyed or interlocking connectors to make an electrical connection to the AC to DC converter.