17. The rated wattage of the electric bulb or the total rated wattage of all the bulbs with which a headlamp is fitted shall not be less than —
(a)
10 watts where the headlamp is fitted on or to a motor cycle which is so constructed as to be incapable of exceeding a speed of 50 kilometres per hour by reason of its construction;
(b)
15 watts where the headlamp is fitted on or to any other motor-cycle; and
(c)
30 watts where the headlamp is fitted on or to any other motor vehicle.