Sch. 1 (iii) a cylinder shall have a diameter of at least 0·6 metre and a height of twice its diameter; (iv) a diamond shape shall consist of two cones as defined in (ii) above having a common base. (b) The vertical distance between shapes shall be at least 1·5 metres. (c) In a vessel of less than 20 metres in length shapes of lesser dimensions but commensurate with the size of the vessel may be used and the distance apart may be correspondingly reduced. 7. Colour specification of lights The chromaticity of all navigation lights shall conform to the following standards, which lie within the boundaries of the area of the diagram specified for each colour by the International Commission on Illumination (CIE). The boundaries of the area for each colour are given by indicating the corner co-ordinates, which are as follows: (i) White x 0525 0525 0452 0310 0310 0443 y 0382 0440 0440 0348 0283 0382 (ii) Green x 0028 0009 0300 0203 y 0385 0723 0511 0356 (iii) Red x 0680 0660 0735 0721 y 0320 0320 0265 0259 (iv) Yellow x 0612 0618 0575 0575 y 0382 0382 0425 0406 8. Intensity of lights (a) The minimum luminous intensity of lights shall be calculated by using the formula:
(iii) a cylinder shall have a diameter of at least 0·6 metre and a height of twice its diameter; (iv) a diamond shape shall consist of two cones as defined in (ii) above having a common base. (b) The vertical distance between shapes shall be at least 1·5 metres. (c) In a vessel of less than 20 metres in length shapes of lesser dimensions but commensurate with the size of the vessel may be used and the distance apart may be correspondingly reduced. 7. Colour specification of lights The chromaticity of all navigation lights shall conform to the following standards, which lie within the boundaries of the area of the diagram specified for each colour by the International Commission on Illumination (CIE). The boundaries of the area for each colour are given by indicating the corner co-ordinates, which are as follows: (i) White x 0525 0525 0452 0310 0310 0443 y 0382 0440 0440 0348 0283 0382 (ii) Green x 0028 0009 0300 0203 y 0385 0723 0511 0356 Sch. 1 (iii) Red x 0680 0660 0735 0721 y 0320 0320 0265 0259 (iv) Yellow x 0612 0618 0575 0575 y 0382 0382 0425 0406 8. Intensity of lights (a) The minimum luminous intensity of lights shall be calculated by using the formula:
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