[Startrek (Martin)]

If using an LED tracing panel ( I use both an A3 for my 8” Carbon Newt and an A2 for my 10” Carbon Newt ) for taking Flats then it’s a must to have a panel with dimming control adjustment.
I use the Huion brand which have a touch control dimmer and at low brightness levels mine don’t suffer from colour shift like some of the cheaper brands.
Exposure time for all Flats are not necessarily around 1 sec. Your exposure time for Flats is dependent upon my factors including the type and characteristics of your camera and what filters you are using. With my Broadband filters I have Flats exposure times of between 0.1sec and 0.5sec and with Narrowband filters have Flats exposure times between 2sec and 5sec.
My cameras are the ZWO2600MC and ZWO2600MM cooled to -10C
I aim for a Target Range of around 8,000 to 32,000 or half way along my histogram and adjust both my Target ADU and brightness setting on my LED tracing pad to achieve this.
I have added a layer of 4.5mm opal acrylic sheet to my tracing pad as my lowest setting on the pad was still slightly too bright. Some folk use a white T shirt but I used an acrylic sheet as it’s just gaffer taped to my panel so permanent.

I’ve been taking Flats using the “Flats Aid” in APT this way for years with no issues at all.

Martin