catnipper Do you have some hardware examples how the flat panel option in ASIAIR should be used (LED vs. EL)?
I don't use ASIAIR's "DC output" port for anything. Not cameras, not EFW or EAF, and certainly not flat panels.
One thing that you might take into account with LED (drawing panels, iPads, etc) versus EL is how they actually work.
While not quite as good as incandescent lamp, which follows the black body curve, the EL does put ot more or less a broadband spectrum.
https://www.bu.edu/lite/lite1/spectroscopy/ELSpec.html
LED panels are made to appear white by combining Red, Green and Blue LEDs (or white LEDs, which are internally made of R G and B LEDs). While the LEDs are not as narrow band as semiconductor lasers, they are still quite narrow:
https://www.saler2uk.com/?product_id=44150596_39
They do not put out a broasband spectrum, but three narrow band spectra.
This becomes important when you are using then to illuminate a narrowband filter for a flat calibration frame.
Take the example above red LED, and the 656.3nm H-alpha narrowband filter. You will notice that if the fliter is very narrow, it will pass very little of the red LED. Sulphur III filters are even farther away from the peak of the red LED. If you have such filters, you probably have seen the low red histogram response.
I personally use a Gerd Neumann panel. They are quite pricey, but lasts a long time if taken care of carefully, to keep their power supply from failing. You can see the spectrum in their ad here:
https://www.gerdneumann.net/english/astrofotografie-parts-astrophotography/aurora-flatfield-panels/uebersicht-aurora-flatfield-panels-overview.html
Chen
