Low light condition

Foster Simplistically, in entrainment the rods and cones provide transitional information at the sharp junction between a LD cycle, and the inner retinal opsins provide irradiance information. What was striking about that rodless-coneless mouse under dim LD cycles is that it was phase advanced and the onsets were bouncing all over the place. Something about the precision of entrainment is lost with the rods and cones under relatively low light conditions. 

Photochromic sunglasses should ideally be colourless under low-light conditions, be converted rapidly to a form with an appropriate absorption spectrum under intense light, and revert quickly to colourless under low light. All of this needs to happen efficiently over a wide temperature range and the system must be capable of an almost infinite number of cycles. 

Yin, K., Harrison, P. J., and Dortch, Q. (1998). Lack of ammonium inhibition of nitrate uptake for a diatom grown under low light conditions. /. Exp. Mar. Biol. Ecol. 228, 151—165. 

Fire Control Devices. The fire control devices used with mortars, howitzers, and tanks use tritium sources to illuminate them in low light conditions. 

Point shooting is a method of shooting without the use of sights and is valuable in low light conditions and when you need to get off a shot faster than you can acquire a sight picture, sometimes it is c led snap shooting. 

Both chemical and visual information is available when a prey species assesses local predation risk. However, contradictory models exist regarding the relative importance of visual versus chemical cues during risk assessment. Laboratory experiments conducted by Hartman and Abrahams (2000) demonstrated that fathead minnows reacted to alarm cues under low light conditions with significantly more dashes than they did in clear water. They concluded that vision was the primary source of information used in predator assessment (visual compensation model), as the minnows would respond to alarm cues with greater intensity when visibility was reduced. 

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