When incoming light is at 100%.
Outgoing light can never be more then 100%.

Unless, the object adds light like a candle, or a TV or PC screen would.

Diffuse + Specular + Reflection can never be more then 100%

In Poser :

Diffuse_Value + Specular_Value + Reflection_Value can never be more then 1.

0.95 would even be better for a total maximum.
Some light is absorbed by the object surface.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!