I think you're expecting too much of the lighting. If you compare it to a point light, you get similar results.

This is a similar setup with a single point light at 24% intensity and an inverse square fall- off

and here it is with the table light set with an emitter with the strength of 2000

It looks like you're comparing it to multiple lights with the fall-off set to constant. If you want your emitter to be constant, use the setup hborre posted.

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