Again you will need to include a zero crossing detector for any chance of success when using thyristor class devices (triac/scr). They are switch devices and require proper gate trigger timing relative to the AC waveform
You have to agree with me with this : A light bulb don't react quickly.
Your schematic is not too clear. A redraw of the schematic will help me out. Did you have a BOM ? Parts lists ?
I hope the sim did not use the same ground.
I will tested it with a 12 V AC and use the Arduino for the PWM and see what happen.