There isn't a flash on the first generation Lytro camera, but the Lytro camera can handle less-than-optimal lighting conditions in many cases.
NOTE: Using Manual Controls will generally improve low-light performance, especially if you can steady the camera to compensate, either with our Tripod Mount or by using something in the environment like a wall, a counter surface, or an (empty!) pint glass.
Please bear in mind the Lytro camera cannot add light to a scene that doesn't already exist. Therefore, at lower levels of light, some graininess will occur. Less light = more graininess.
In other words, the Lytro is a long, long way from anything like night-vision goggles.
NOTE: This article applies to the first generation Lytro camera only. Information about the LYTRO ILLUM's flash capabilities can be found here.