I've had a look myself. the numbers posted by nero are the ones that go with all the ships, and I believe ARE the proper color.
Edit: the default color is a bright light blue. however, the one DJ provided with this pack is a little bit purple
"ShieldGeneratorShieldGlowColor.SetRGBA(0.203922, 0.631373, 1.000000, 0.466667)" is the setting for the default BC sheild color for federation ships.