Wow a Chaff grenade.
Never thought of that... Anyway the Good News about the dark is you dont have to do the electric floor thing again. The Bad thing is your View range is limited, you can only see enemies if they are inside your sight, (Represented by yellow squares.) Thermal Goggles will help a little, plus they can help you see Laser Tripwires.
My sig is lost. Please contact if found.