Use at your own peril. They're illegal.
I have also copied my response to a sticky post, since this sort of question seems to come up almost daily.
Intermittent red light restricted
(14) Subject to subsections (14.1) and (15), no person shall use a lamp, other than the vehicular hazard warning signal lamps commonly known as four way flashers, that produces intermittent flashes of red light. R.S.O. 1990, c. H.8, s. 62 (14); 2007, c. 13, s. 17 (1).
Red and blue lights to the front restricted
(14.1) In addition to the lighting requirements in this Part, a police department vehicle may carry lamps that cast red and blue lights, but no other motor vehicle shall carry any lamp that casts red and blue lights to the front. 2007, c. 13, s. 17 (2).
Red light in front
(15) In addition to the lighting requirements in this Part, a vehicle described in subsection (15.1) may carry lamps that cast a red light only or such other colour of light that may, with the approval of the ministry, be designated by a by-law of the municipality in which the vehicle is operated, but no other motor vehicle shall carry any lamp that casts a red light to the front. 1998, c. 35, s. 103.
Same
(15.1) The following are vehicles to which subsection (15) applies:1. An ambulance, fire department vehicle, police department vehicle, public utility emergency vehicle or school bus.
2. A ministry vehicle operated by an officer appointed for carrying out the provisions of this Act or the Public Vehicles Act, while the officer is in the course of his or her employment.
3. A vehicle while operated by a conservation officer, fishery officer, provincial park officer or mine rescue training officer, while the officer is in the course of his or her employment.
4. A vehicle while operated by a provincial officer designated under the Environmental Protection Act, the Nutrient Management Act, 2002, the Ontario Water Resources Act, the Pesticides Act, the Safe Drinking Water Act, 2002 or the Toxics Reduction Act, 2009, while the officer is in the course of his or her employment.
5. A prescribed class or type of vehicle, driven by a prescribed class of persons or engaged in a prescribed activity or in prescribed conditions or circumstances. 1998, c. 35, s. 103; 2002, c. 4, s. 64; 2002, c. 18, Sched. P, s. 19 (2); 2007, c. 13, s. 17 (3, 4); 2009, c. 19, s. 68 (1).
Green flashing light restricted
(16) The following persons may carry on or in his or her vehicle and operate a lamp that produces intermittent flashes of green light:
1. A firefighter, within the meaning of subsection 1 (1) of the Fire Protection and Prevention Act, 1997, while proceeding to a fire or other emergency.
2. A prescribed class of volunteer medical responder, while driving a prescribed class or type of vehicle or engaging in a prescribed activity or in prescribed conditions or circumstances. 2007, c. 13, s. 17 (5).
