Particle Shadows seem overly dark after 4.9

Hi,

What I mean is that even when setting the directional lighting intensity to 0.1 or any low value, the spirtes still go pitch dark when inside the shadow drawn in your little project here.

Check this is my material setting:


And I get this:


So I would like to be able to tweak this darkness, its too much at the moment and it makes my white dust effects go pitch black in interiors. So for example all my bullet hit effects inside buildings show pitch black even when the level is set to daylight.

Any way to tweak this darkness?

Thanks!