Why does the "dim bulb test" limit current instead of adding load to the supply?

[mmagin]

Also instead of a 100W light bulb that's illegal can I substitute it with a CFL with a really high CRI that says it's as bright as a 100 watt on the box?  Will I get arrested if I plug in a 100 watt filament bulb by the signals it sends to the power company?

You can still buy certain industrial / rough service incadescent 100W bulbs like https://www.amazon.com/Bulbrite-100A-RS-2PK-Incandescent-Service/dp/B017ULQIZW
Also, there are somewhat lower wattage halogen replacements (halogen tube inside an outer A-series envelope) you can use.