F1[F24U.K.The recommended blue colour is obtained when its chromaticity is within the boundaries of the International Commission on Illumination (ICI) chromaticity diagram defined by the following equations:
| green boundary | y = 0.065 + 0.805 x; |
| white boundary | y = 0.400 a x; |
| purple boundary | x = 0.133 + 0.600 y. |
The recommended flashing rate of the blue light is between sixty and one hundred flashes per minute.]
Textual Amendments
F1Fifth and Sixth Schedules inserted (20.7.1998) by 1995 c. 27, s. 6, Sch.; S.I. 1998/1505, art. 2
F2Fifth and Sixth Schedules inserted (20.7.1998) by 1995 c. 27, s. 6, Sch.; S.I. 1998/1505, art. 2