The accuracy standards you hold yourself to during the day will come back to either help you or hurt you in low light.
If your concept of combat accuracy is hitting paper at 7 yards on a stationary target in the daylight you are going to be up that bad, bad creek without a paddle at night.
You need to be able to keep your shots within the A zone of an IDPA target, essentially shooting groups you can cover with your hand during the day to have any hope of acceptable accuracy at night.
When you get people under stress, trying to remember how to hold their handheld light and to use it in a tactically sound fashion, typically trigger control suffers immensely.
The more clock cycles of brain power you have to dedicate to these other tasks, the less likely it is that you'll give the proper attention to properly controlling the trigger.
Trigger control is the fundamental building block of accuracy and without exercising proper trigger control you won't hit a bloody thing you mean to hit… that means you need to develop these other skills to an almost reflexive level through PERFECT PRACTICE if you want to have the best shot at making the hits you'll need to stop a threat.
The best thing you can do to aid your accuracy in low light is to hold yourself to a VERY HIGH accuracy standard during daylight shooting understanding the whole time that under stress and in conditions of low light your accuracy will degrade from the peak you experience on the range.
If the best you can manage during daylight hours with nobody shooting back at you is barely keeping it on paper, then you are in real trouble when the fertilizer hits the fan.
Remember: Every bullet you fire has a lawyer attached to it.