> adaptive 0 is still 2x2 (at least)
> adaptive 0 does not mean off.
> apparently
> 
> 
> 
The only way to turn adaptive OFF is to NOT use the adaptive key word.

In adaptive N, the initial number of samples is :

2^N+1

2^0=1 +1 =2
2^1=2 +1 =3
2^2=4 +1 =5
2^3=8 +1 =9
...

Also, the actual number of samples will follow that same pattern and 
will use the smallest number of samples that is AT LEAST the requested 
number.

area_light x z 4 4 adaptive 0
will actually use a 5x5 array.
area_light x z 6 6 adaptive 0
will use 9x9.

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