For my low light photography, I wait until it is dusk or dark and put the shutter speed really slow. Sometimes all the way to 30 seconds. This way you can capture light in ways you wouldn't see during the day. I also used a tripod for some in order to prevent camera shake and to get a clear photo.  The ones at the Golden Gate Bridge  are some of my favorite shots ever because the sparklers add so much interest along with the famous Bridge. The reason why I like to shoot this type of photography is because they are an example of something kinda unusual which is probably the reason I love them. Please enjoy!