Steam ArmA 3 Alpha - 0.5.102571
I was expecting the muzzle flashes to generate a bit more light in these near-dark conditions. The flash correctly increases in intensity during the night and decreases to the "small flash" variant during the day.
The issue is also sometimes apparent at "dim lighting" conditions, like heavy overcast. But I was not able to reliably reproduce this.
Issue and comparisons with other day and night conditions attached in the zip file.