I can’t say I’ve ever seen a picture of Mars at night with artificial lighting.

The SHERLOC WATSON camera is on the rover’s robotic arm, with the camera placed really close to the target for this image. The width of the posted image is less than one inch (2.5 cm) across, and lit with just one bank of white LEDs. The use of just one bank of LEDs provides shadows, those shadows help reveal the surface texture etc. The white LEDs are banked on each side of the lens, here is a link to the image with the other bank of LEDs turned on Link1 and an image with both banks of white LEDs turned on Link2

In addition to the white LEDs, the camera has two 365 nm long wavelength UV LEDs. Certain minerals fluoresce when exposed to specific wavelengths of UV light. They acquire images before using the UV (dark frame) then an image with the UV LED lit, and additional images after the LED is extinguished to see if there is any fluorescent emissions. The sol 1613 post UV light images we can just see the features of the target in an otherwise dark time exposure image. I can’t recall seeing that before, it does not appear to be coming from the surface so I can only assume the larger of the Mars moons (Phobos) was passing overhead during the exposure of the image, or they could have been targeting the surface with the UV laser that’s built into the camera suite Link3

For those that want to learn more about the camera, here’s a great link4