I had the brightness turned up all the way (which isn't very bright compared to a laptop screen).
Unfortunately, I'm having computer problems so I'm delayed in doing further debugging right now. I will update this when I get back on the air.
Thanks for your response. Mike

Hello, I just started using the FlatMaster 150 and have noticed a problem. There is a sizeable ripple in the output that shows up when applied to the lights that I've taken. Attached is a (compressed jpg) of a flat taken with an ZWO ASI1600MM Pro with a Lum filter. From PixInsight, the statistics fo...