Identify what your recipe needs: fruity Caribbean heat (use habanero/piri piri) or straightforward chili heat (use Thai chili/serrano).
Use the listed ratio as your starting point, then adjust in small increments (especially if using powder or flakes).
Chop fresh peppers finely and add early if you want the heat to distribute; sprinkle powdered/flaked options near the end for control.
If your swap tastes “flat,” add acid (lime/vinegar) to bring back scotch bonnet’s bright bite.
Taste and correct: add more heat only after acid and salt are right, so you don’t over-spice.