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The "dimmer" setting on the 3-lever switch reduces the voltage applied to the regular lamp bulbs by a series connected resistor. The resistor is a 30 Ohm/8 Watt unit, so the drop across it depends on the load. You'd need another 30 Ohm resistor (also 8 Watt) to ground if only the LEDs were used...

Good job! A couple of alternate ideas, using a different bulb will position the filament better (my final choice) or using a strip of LEDs.