clipka wrote:

> If you think your floor is too dark, increase the emission of the HDR 
> sphere; you can safely set it to values greater than 1.

but isn't it strange not to get full white with pigment 1
and emission 1, regardless of environment? Even with HDR output
it seems to me the output is maxed out so additional lighting
and reflections have no effect (unless negative?).

Actually this led me to play around with negative finish values:

Negative ambient and emission seem to work fine, diffuse
lighting and reflections seem to be clipped at 0 (tried
using 3.7RC3). I'd vote for allowing negative values there
too - light sucking reflections might surely be fun ;)

The effect of diffuse < 0 can also be achieved with
negative light sources, of course, but then affects
all objects).

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