Arduino AC Voltage Dimmer (Variable Resistor? PWM?)

hello,

i have passive device (let's call mylamp, see attached) requires 65v 60ac when turned on. maximum current draw in 0.04 range.

my goal able manually dim "mylamp" bringing signal down, ability have load see full power.

i tested 10k-100k slide potentiometer, gets me close desiring, need controlled using arduino , able not burn 65v ac source.   

can recommend specific device can controlled using arduino in order / manually adjust amplitude of ac signal / adjustable resistance seen mylamp?

high power voltage controlled resistor? method of pwming signal? kind sort of power transistor?

thanks!
 

it run on 65v dc, too.
what's 65v ac source?

if need vac need triac.

you use 120/220v transformer, put 120 220 side , 60 or out.

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