Linear Light Dimmer by Power Mosfet

When change the value of R2 Intensity of Lamp change to this circuit shows the usability of Mosfet be Variable Resistor. By Q1 use N-Channel Power Mosfet. but what is the number all right follow the size of Load or Lamp there. When change the value of R2 Intensity of Lamp change to this circuit shows the usability of Mosfet be Variable Resistor. By Q1 use N-Channel Power Mosfet. but what is the number all right follow the size of Load or Lamp there. The lamp use 4Volt to 6Volt sizes by use power supply Voltage 6V.

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