Night Blindness
Bonus: 5 BP
When limited by this quality, a character’s (natural) eyes do not adapt to well to darkness and he has difficulty operating in dimly lit environments. This quality adds an additional –2 dice pool modifier to any other visibility modifiers in any lighting conditions worse than normal daylight (or the equivalent). This quality is incompatible with the Blind quality and with cyber or bio-replacement of the eyes.
Bioluminescence
Bonus: 5 BP
The character produces the pigment luciferin and the enzyme luciferase in her hair and/or skin, creating a “cold-light” green-to blue glow via a chemical reaction. Though too weak to observe in normal light, it is bright enough to spot, locate, or target the character in partial light or full darkness, negating visibility modifiers. The glow is sufficient to enable a character with low-light vision to see as if in daylight.
This would interact differently with Thermographic than it would with Low Light.
Thermographic Vision allows normal vision across a wider wavelength spectrum. Night Blindness would effect Thermo just like any other vision, so in situations where heat signatures are lower than normal (target wearing winter clothes, looking through a wall, etc.) it would still apply the -2 modifier. I would allow a character with Night Blindness and Thermo vision to ignore the penalties for Night Blindness if the targets are fully visible in the Infrared spectrum though.
Low Light Vision means that the eyes collect more ambient light like a cat's. Night Blindness means that the eyes do not adjust well or operate well in darkness. It is entirely possible for both of these features to operate by different biological processes and effect the same eyes at the same time. I would simply stack the modifiers. Easy.
As for Bioluminesence and Night Blindness, of course they stack. It even makes sense: If you are never in the dark, your ability to see in the dark atrophies. If you have a natural ability to see in the dark (Low Light Vision) it doesn't go away, but it doesn't work as well (because it stacks with Night Blindness).
That said, Bioluminesence isn't that much of an advantage. While it may make you able to see, it means everyone else can see you. Stealth is largely ruled out. It eliminates visibility penalties to anyone attacking you. Also, the more you cover up, the less benefit you should logically get from Bioluminesence.
It is up to the GM, but I would say that in normal clothing you would get half-benefit, and in full ninja-gear you would get no benefit (same for anyone attacking you).
