Look for light balance settings, and try taking the same picture - easier if you're using the tripod - with different settings.
If it's set to auto, the camera might not detect everything correctly due to the non-linear spectrum of the LED lights, and compensate incorrectly.
There should be options for different settings, like 3000k and 6700k and nighttime, and incandescent and whatever... depending on your camera.
see what looks best at each stage of the light settings, and use those settings when taking pictures. Personal preference is what looks the most natural... but your pictures.
Exposure bias will under or over expose (make the picture lighter or darker) by a stop or two depending on how you have it set, so simply just lighter or darker
Vivid color setting sounds like a euphemism for over saturated... basically I expect color values are just being turned up to 11, if something is low already, it won't get as high as the other colors.
all this is part of post processing, as it's an automatic camera, or mostly, it's being done in the camera. You should be able to take a picture as neutral as possible (shutter or aperture priority won't affect the color of the picture, but more depth of field, motion blur and such) and process in an external program (look for something like 'curves', I think you can find a few tutorials on the Gimp website)
but, yes, I would say over saturated... just not overly so... I do still like them very much, I'm more interested in the specific plants though, and not the overall layout, as I know I could never handle anything like that
