How to get a light to cancel out shadows

Questions
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1

Can one light source cancel out the shadows of another on a MeshLambertMaterial?

Example: https://codepen.io/anon/pen/gNRwzX

There is a cube casting a shadow on a plane from a directional light. On the far side of the cube there is a point light that should lighten the shadow but doesn’t. MeshPhongMaterial behaves more like you would expect but is it possible to do this with MeshLambertMaterial?

Thanks

2

Hi!
Maybe this will be helpful:

3

Yeah, that explains the behaviour. Thank you!