How does the power from the source relate to the power output of the lamps
Answers
Answer:
Nothing, as long as the output at power source keeps putting out the same voltage (and frequency in a few special cases). Each bulb will produce the same output because it is always receiving the same input in the parallel configuration, where I assume the wiring is big enough to not contribute additional voltage drop as lamps are added (easily avoided by using separate leads from the power source to each lamp).
There is a tiny possible exception; if the lamps are tungsten types and the light and heat output of the other lamps adds some extra heat to the filament of the lamp being considered, this could raise its temperature slightly and thus raise its light output. This is conceptually possible but probably would be relatively hard to measure well enough to be sure it is happening.
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