Shadow plane - which blend mode?

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Sledge

I tend to use Multiply 2 (mode 5)*

*Edit: Mind you, that was for generating a shadowplane in realtime... I'll have to have a rummage as it's been a while and I never comment properly. Normal multiply should definately be useful to you, Multiply 2 simlpy blends so that color 128,128,128 has no effect and anything brighter lightens while any area less bright darkens. God only knows what I was up to.