... and that would be why it's illegal.
Sitting in a parking lot off the roadway, lighting can be whatever you want. Impersonating an emergency vehicle would probably still be troublesome if it is a public-access parking lot (e.g. timmies).
As soon as you are on the road, safety has to be the first priority. People expect vehicles coming towards them to have white and amber lighting and vehicles moving away from them to have red lighting (and possibly amber flashing turn signals, and indirect white lighting of a license plate). If you don't look like an approaching vehicle, expect not to be treated like an approaching vehicle.
P.S. I've modified forward lighting on a couple of my bikes ... but the modification has consisted of changing the normally off turn signals so that they also act as amber running lamps (on all the time, except flashing when the turn signal is activated). White and amber only ... and it looks stock ... and to someone up ahead, it looks like an approaching vehicle, as it should, except that there are some more lights to hopefully wake them up and see me.