Thanks for the link Barry i just roughly worked out from that formula to aim for 2981ADU.
targetADU = Bias + 10*RN*RN/camera_gain
Not sure if this is correct!
351+ (10x11x11)
______
0.45
=2981 ADU
and here is what averaged for each channel in the image at 10min subs
L=15,000
R= 3,500
G= 3,800
B= 4,100
So does that mean i have overexposed the light frames with around 5x to much exposure?
Does this just mean that i'm not getting any extra data with the longer subs (wasting time) or is it more about over blooming stars and colour balance?
Thanks for helping me out with this BTW