That's correct. There is no flash with a gopro. There are some after market lights that are relatively inexpensive but they are pretty much marketed and designed for diving.
With that said, both cameras have a low light setting for taking pictures of say the fireworks at night. On the Silver, you manually have to put the camera into low light mode where the Black its automatic.
The other true down side other then a ttl flash or a flash in general, is that they don't zoom. So in some instances, it will not replace a DSLR or a true video camera.
Ill try and post a video of the
MNSSHP parade I took last year when I get home tom and thatll will give you a pretty good indication of how it does at night.
Where I find that that Gopros come in real handy, is in a parade setting, where on a monopod I can run it out to its full length, and not block anyones view and still get good video.