It's around 4months since I actually did this but, I built light boxes for each scope out of foam board with 4 white LEDs inside. They push onto the end of the scopes. The one for the 10" is big.
The qhy9 has a slowish shutter so flats must be over 3 seconds or you'll see shutter artifacts in the flats. To get that long an exposure for Lum, I plug the light boxes into the dew controller and turn it way down low. I have each filter set to the right exposure times in a maxim sequence, so I just expose on the Lum filter and turn the light box down until it bells around 20K on the hystogram. If that filter is right, the rest will follow.
No fancy led sheets here, there's at least 3 cartons of crownies wasted with that stuff
