I recently installed a 24"x 24" LED flat panel in my observatory for flat frames. It is mounted ~ 16" from the front of the dew shield of my SCT. Unfortunately, even at the panel's dimmest setting and with a 2-layer white T-shirt, L (1x1) and RGB (2x2) exposures for the correct ADU are sitting between .6 and .8 seconds. I would like longer exposures, and am considering using a dark-colored T-shirt instead of the white one to increase dimming of the panel. My question is: If I'm using a mono CCD camera (QSI 683) should the color of the T-shirt make any difference? My thinking is no, but would appreciate your thinks.
- - Steve