What's inside this LED panel, how easy to modify?

[mcovington]

Has anybody here ever reverse-engineered an LED tracing panel like this one?
https://www.amazon.com/dp/B07D57F8X7/

I use it in front of my astronomical telescope to take flat frames (photographs that record the uneveness of the light distribution, including spots of dust, so it can be corrected).  I'd like to make it a little easier to use: have it light up only at its minimum brightness setting, with an on-off switch (or whenever power is applied), without variable brightness or any other functions.  I gather it is not pulse-width modulated, so basically we're dealing with a power supply.  Can anyone tell me more?  (I'm quite conversant with electronics, just too lazy to open it up myself before asking whether others have.)  Thanks!

[Krotow]

Pretty much look like the new incarnation of the good old photo negative viewer. Or base of microfilm viewer. That Amazon frame have matte mirror film at bottom, perpendicularly mounted white LED-s around frame inside rim and matte glass above all. LED driver and switch are hidden inside frame too. Rougly like in this frame (not mine).