This is from the CAMS manual "Vehicles must also be fitted with at least one rearward facing amber lamp, of at least 18 Watts power and wired so that it operates at all times when the main power is switched on"
Thanx friz, i just read the manual and 18 watts is the minium for rear facing dust lights i was also interested on the minium for forward facing lights?u can also use led for rear facing lights..