Archer Point Light by the Commonwealth between 1964 and 1979. By order of construction the lights were Cape Capricorn Light, New Caloundra Light, Point Danger Light, New Burnett Heads Light, Fitzroy Island Light, Point Cartwright Light and itself. The light characteristic shown is four flashes, separated by two seconds, every twenty seconds, White at 153°-276°, 305°-313° and 334°-338°, Green at 276°-305° and 320°-334°, Red at 313°-320° and 338°-358° (Fl.(4)W.R.G. 20s). The white sector indicates the clear passage into the channel, while the red and green sectors indicates the ship is outside the channel. The current light source is a 35,000 cd 120 Volt
Colour centre the recognition of shapes, motion, and colour. V1 has multiple areas that are colour-sensitive, which indicates that colour processing is not limited to one area. According to a paper by Dr Robert Shapley, V1 has an important role in colour perception. fMRI experimental results showed that V1 has two kinds of colour sensitive neurons: single-opponent and double-opponent cells. These cells are integral in the opponent process of interpreting colour signals. Single-opponent neurons respond to large areas of colour. This is advantageous for recognizing large colour scenes and atmospheres. In comparison, double opponent cells respond to patterns, textures, and colour boundaries.