Quantity   Component name
1 × arduino nano CH340G Do NOT use prolific or FTDI! It will not work
1 × LM358 Any opamp will work, rail to rail will work better.
1 × MOC3020 Just use that without zero crossing detection
1 × TRIAC >8A >600V Any triac will work
1 × 12V transformer Any will do, >500mA rating, double insulation.
1 × Halogen lamp - Tesla HPZ 600W/225V Owerpowered short halogen lamp