L6. Installation Power Distribution
L7. Building Infrastructure-Line Power to Site Installation Power
L8. Outside Plant Power Distribution System
To further clarify these levels, a rough schematic representation is shown below in Fig. 17 that
highlights each of the segments. It should be noted that while Levels 5–8 are typically common
regardless of the light source, Levels 1–4 often differ markedly due to the designs of the light source.
Fig. 10 Lighting level schematic
The intent of these levels is to provide differentiation between the different interconnect needs
typically found in lighting applications. Detailed definitions of each of the proposed eight levels with
lighting examples follow.
Level L1—Basic connection to the light emitting element. For an LED, this would be the wire
bond to the die. For an incandescent bulb, it would be the weld to the tungsten filament.
Level L2 — Interconnection to the light source. In the case of an incandescent bulb, this
would be an Edison base. For T5/8/12 fluorescents, it is the "tombstone". For LEDs, this is typically a
solder joint.
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