Weekly Task: Testing Shutter Speed, high vs low

After playing with the shutter speed I now know how the exposure comp. works on a canon camera. I have already done a combination of these kinds of images which can most likely bee seen in my contact sheets. The images below however show a real difference. The first has an shutter speed of 1"6 making it quite bright, while the second image has a shutter speed of 1/13. 

Shutter speed: 1"6

Shutter speed: 1/13

I have learnt through photographing with my camera that at night and during the day the shutter speed needs to change in order to take a photo with an appropriate amount of light. If the image with a shutter speed of 1"6 was dimmer, but lit with smaller lights, much like a city scape it would be more successful.