Just thrown together full support for the "brilliance" keyword in radiosity.

This scene is illuminated by a yellowish classic circular area light 
(with area_illumination) on the right, an emissive disc of matching 
size, colour and brightness on the left, and a blue sky sphere.

All spheres (except the rightmost in the back row) use "diffuse albedo 
1.0", with varying brilliance.

Front row, left to right: brilliance 0.5, 1, 2, 4, 8

Back row: brilliance 32, 64, 256; the rightmost sphere is a reflective 
sphere (with an albedo 1.0 ultra-low roughness specular highlight) for 
reference.

Note that what looks like blurred reflections in the high-brilliance 
spheres is really just a static blurred projection of the environment 
along the surface normal. It might be useful as a "poor man's blurred 
reflection" nonetheless.

(It should also be noted that illuminating radiosity scenes with 
comparatively small bright emissive objects is generally a bad idea, and 
needs crazy high radiosity count settings; in this scene, I used "count 
100000,1000000".)

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