Yeh I'd say the day editing to night won't work too well. I've never tried it, but I don't think it would be easy to get right. Just try and get as much light as possible on the shoot, whether it requires a change of location or some unique lights (car headlights could work), and then to get more light on the camera always go manual mode and keep shutter speed normal at like 1/60 if you're shooting 30 frames, get f stop as low as possible (opening aperture), and then adjust ISO to suit. The reason being is that a lower f stop will allow more light, as will increasing ISO (as will lowering shutter speed), but increasing ISO increases light but also increases grain, whereas decreasing f stop increases light, and even though it makes the depth of field shallower, I think it's a better trade off.
So basically you'll just be playing with the ISO. Just set the ISO to whatever is bright enough, and just start at 800, but try not to go over 3200. Also remember that it is dark and not everyone will be watching what you shoot in the dark, so it won't be as easy to see on a screen as it is to see on the camera screen in the dark, so compensate for that a little. So if it's a toss up between 3200 ISO but a little dark or 6400 at good lighting but a bit grainer, go for the 6400 if that's the situation you're in.
If that didn't make sense let me know what parts and I'll explain it differently
![Smile :) :)](/styles/default/xenforo/smilies/smile.png)
[DOUBLEPOST=1378984540,1378984178][/DOUBLEPOST]Also I have some of these
amazon . com /Neewer®-CN-160-camera-video-light/dp/B004TJ6JH6
And they're really good! They can mount on top of your camera on the hotshoe, and they're really bright, come with three different colour filters, and has an adjustable brightness dimmer control. They could be a great help for whatever it is that you're filming. I use mine all the time!