Is it legal for cyclists to use amber bike flashers for visibility (in BC, Canada)? Amber bike lights can improve daytime visibility. This makes sense because white light looks similar to sunlight and amber light stands out more clearly. Being seen sooner means that drivers have more time to react. Possible situations that benefit from improved visibility include users changing lanes, traffic circles, users turning, drivers opening their doors, users waiting at cross streets, and oncoming users passing. Also, amber may be easier on our eyes which can improve safety even more.

The question is whether it's legal to use them in BC? Does the BC Motor Vehicle Act say anything about it?

If it's not legal, then a possible alternative might be to avoid strobe patterns.

Dinotte sells amber bike headlights.
http://www.dinottelighting.com/LED_bike_lights/dinotte-daytime-amber-aa-headlight.htm

Video of a Dinotte amber light being used:

                
            

From local bike stores, it's getting more common for bike lights to have amber for sides.
https://www.mec.ca/en/product/5053-077/Bottle-Blinky-Sidelight
https://www.mec.ca/en/product/5055-194/Urban-900-Light

Here's are some custom made ones.

                
            
https://www.instructables.com/id/High-Powered-Yellow-Bike-Light-FrontSide-Combo/
BC Canada

https://engineering.ok.ubc.ca/__shared/assets/Bike_Sense-Nov0552189.pdf
says


  After dark, all cyclists are required by law to have a front white
  headlight visible for a minimum of 150 metres, a rear red light
  which should be visible for a minimum of 100 metres, and a
  rear red reflector visible for 100 metres when directly illuminated
  by a car headlight. Many rear red bicycle lights sold currently
  are also designed to function as a reflector and are legally
  acceptable. Flashing red rear lights are also acceptable. Lights
  and reflective devices come in a wide range of shapes, sizes,
  colours, and costs and should be mounted directly on the bicycle.


There's an implication at the end that body-mounted lights are bad, but whether that's law or a suggestion is not stated.

There's no stated restriction on colour.  The only mention of flashing relates to the rear light which is permitted.

http://www.icbc.com/road-safety/sharing/Pages/cycling-safety.aspx says


  Your bicycle must be equipped with a white headlight visible at 150 metres and a rear red light/reflector visible at 100 metres


https://www.thenoteup.com/single-post/2017/02/28/Helmets-and-bike-lights-BCs-cycling-laws reiterates the same.  Neither make mention of flashing fronts.

ANSWER Ambiguous - but you're unlikely to get in trouble for the colour of your lights.  Flashing seems to be conspicuously absent for anything but rear lights.