Well, I found that generally speaking the scatter-based shaders are all darker than we're used to. This may be because we have all gotten used to shaders that are unrealistic. I've been considering that possibility for a few weeks, and experimenting with diffuse value on non-scatter shaders set to .4 instead of .8. Of course, this would mean adjusting every shader you have to match scatter shaders and then boosting all the lights you've ever used.

or...

If you took a look at some of the other scatter shaders I posted, you'll see an HSV node in every one. That is there to boost the output of the shader.

In this shader, if you insert an HSV at the Alternate_Diffuse, you can use it as a final amplifier stage, adjusting the luminance via the HSV "Value" parameter. Increase it above 1 to boost the output.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)