Here's an excerpt from the regs (they're pretty restrictive):
Auxiliary driving lamps
4.09 (1) A motor vehicle may be equipped with 2 auxiliary driving lamps, mounted on the front of the vehicle at a height of not less than 40 cm and not more than 1.06 m, that are capable of displaying only white light.
(2) An auxiliary driving lamp must be directed so that the high intensity portion of the beam is, at a distance of 8 m from the lamp, at least 12 cm below the height of the lamp and, at a distance of 25 m from the lamp, not higher than 1.06 m from the road surface.
(3) An auxiliary driving lamp must operate so that it is illuminated only when the upper beam of a multiple beam headlamp is illuminated.