Im far from a guru but I get a pleasing result.
I use a flat panel which has 4 touch settings, piece of frosted white perspex and a white bin bag liner. Ie White plastic bin liner over scope with elastic or velcro and get it fairly tight (dont worry about crinkles as you wont see them) then perspex I then adjust the light panel from low to high to get the desired ADU. Turn the light panel around if still too bright. I like around 24000ish for LRGB SHO. My flats (dependent on filter) are from 3.0s and up. I do not like any flats them lower than 3.0s. If still bright throw some A3 A4 between the perspex and flat panel. I use a ZWO 2600MM.
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