With 1 table spoon of Deggi and a teaspoon already in the mix power, its not hot at all for me. I need to put at least 4 bird eye chillis in too. Last night I ran out of chillis so had to treble up on the powder. It did end up hotter than 4 fresh cut chillis but not too much.
Curry ended up much like the local, rich and red, their Madras is hotter than most it seems but they may have tailored it to me over the years or maybe its more oldschool? I'm only in my early 30s and started eating curries when I was 13 so don't really know about 70s 80s Madras. Most other places, especially restaurants I've gone to lately, madras might as well be a masala.