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Nope, not natively. To simulate lights with falloff you need Buena Depth Cue, which basically overwrites all 3D shading of AE itself.
If you are only using the one light, you could also tie the illuminated layers' material properties to the distance to the light using expressions.
I gave it a quick try and came up with this:
> mainLight = thisComp.layer("Light 1");
> falloff = effect("Falloff")("Slider")/10000;
> lightDistance = Math.max(length(mainLight.toWorld([0,0,0]), toWorld(anchorPoint))*falloff, .01);
Add a slider control called "Falloff" to your layer and then apply the expression to the Diffuse and Specular material properties. You should be able to use the Falloff slider control to adjust the falloff. It's a work in progress, and needs much better controls to normalize the falloff layers to the illumination of any non-falloff layers, but it's a starting point.
Unfortunately i'm using lots of layers and lights, so the Depth Cue would be the solution for me.