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12 Level L3—Interconnection to the light source assembly. For an Edison base, this could be a crimp contact. For a fluorescent tombstone, this is typically either a poke-in or crimp termination. For LED assemblies on a printed circuit board (PCB), this could be a wire solder joint or a separable connection providing power into the assembly or to another assembly. Level L4—Connection from an internal power supply to the light source assembly or device. For LEDs, fluorescent and metal halide systems, it is the power supply/driver/ballast output connection. This level is not required for primary direct-wired fixtures. Level L5—Primary power interconnect from the primary installation wiring to the fixture. Level L6—Fixture/installation primary power distribution. The installation is defined as the area where the light source(s) is(are) installed for use. This could be an automobile, building, office cubicle, room, or other similar area. An example of this would be a manufactured wiring power system used in an office environment to distribute primary power in an office cubicle. Another example is a manufactured wiring system used to connect and distribute power to lighting fixtures in a suspended ceiling. Level L7—Premises line power feed to the installation power distribution (L6) or power source (L5). This is typically line voltage of 120VAC, 220VAC or, in some lighting applications, as high as 347VAC. Level L8—Outside plant electrical power distribution system. It is similarly made of a number of systems with natural demarcations that could serve as the basis for a future paper on outside plant electrical levels but for the purposes at hand, we will refer to all outside plant levels as a single level L8. At this point, it should be evident that there are marked similarities between the above lighting levels and the original Eight Levels of Electronic Packaging, to the point that Levels 7 and 8 are identical. The similarity is further illustrated in Table 1 below: ELECTRONIC LIGHTING Primary Element Connection Light Element Connection Component to Circuitry Light Source Device Connection Circuit to Circuit Light Source Assembly Connection Subassembly to Subassembly Internal Power Supply to Light Source Assembly or Light Source Device Subassembly I/O Primary Fixture Power Input System to System Installation Power Distribution Building Infrastructure Building Infrastructure Power to Building Power Outside Plant Power Distribution Outside Plant Power Distribution Table 1.Comparison between lighting and electronic levels