LED replacement lamp and a method of replacing preexisting luminaires with LED lighting assemblies

A system for retrofitting an outdoor luminaire that comprises an opening through which or from which light is provided, the system comprising:

• a plate that is shaped to fit the opening and that comprises a recess;
• an array of light emitting diodes disposed in the recess along a surface of the plate;
• and
• an electronic power module electrically coupled to the array of light emitting diodes, wherein a heat sink projects from the plate opposite the recess.

A system for retrofitting a street light that comprises a light source mounted in an enclosure, the enclosure comprising:

• (i) a door that opens towards a surface to be illuminated or is removable, (ii) an aperture through which or from which light from the light source is provided towards the surface;
• and (iii) a light penetrable cover disposed at the aperture, the system comprising:
• a die cast plate dimensioned to fit the aperture and comprising a first side from which heat sink fins protrude and a second side;
• an array of light emitting diodes disposed along the second side;
• and
• a power supply disposed adjacent the second side for powering the light emitting diodes,
• wherein the system replaces the light penetrable cover and the light source.