In Washington state we have the RCW (Revised Code of Washington). According to the RCW, "on any motorcycle regardless of age, the taillight may also contain a blue or purple insert of not more than one inch in diameter". They're not real specific as to the construction of this "blue or purple insert". Would one containing nine LEDs with the ability to be wired in a running light/stoplight setup qualify??? I'm tempted to give it a try because blue stands OUT in long line of red taillights, but too much attention may be a bad thing. 

I might be better off going for a more subtle version with no LEDs. Simple 1.2.3 Drill.Insert.Bend

Not real sure yet. What do you think? Are these legal in your state?

Reply to same question on PNWRiders.com by an oregon police officer:

Old School Blue Dots
" Quote:
Originally Posted by adidasguy View Post

There was a thread about blue lights. I was going to post the RCW law there but we're supposed to start new threads, so I am.

Anyway, here it is and I wonder if anyone know the reason for this exception for blue lights and how this became law? In the other thread, depending on where the blue LEDs were, they could have been legal according to this law. If they were illuminating the license place or were special effects lighting, they blue would be illegal.

I was talking with an officer once about lights and colors on my bike. In searching the laws, I found this law which no one seems to know why it exists - note the part regarding a 1 inch blue circle:

RCW 46.37.100
Color of clearance lamps, side marker lamps, back-up lamps, and reflectors.

(1) Front clearance lamps and those marker lamps and reflectors mounted on the front or on the side near the front of a vehicle shall display or reflect an amber color.

(2) Rear clearance lamps and those marker lamps and reflectors mounted on the rear or on the sides near the rear of a vehicle shall display or reflect a red color.

(3)the taillight may also contain a blue or purple insert of not more than one inch in diameter, and except that the light illuminating the license plate shall be white and the light emitted by a back-up lamp shall be white or amber.

Added: I discussed it with the officer regarding lighting that I had inside the cowlings that gave the bike a nice blue glow at night. He said that was a no-no if it can be seen at night. Since not visible during the day, daytime didn't mater. I could use red, orange, amber or white. Since the bike is white and blue, he suggested go with white. If the bike is moving on the street, blue is out. If the bike is parked for "posing" or "photos" then you can do anything you wish.

He gave me a brochure he wrote on what you can and can't do for lighting. I converted it to a PDF for him so he could easily distribute it. if the moderator PM's me, I can email you the PDF for posting. The officer said he's glad I PDF'd it and to freely distribute it to the biking community.

The Reply:
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Oregon has a similar law on the books regarding blue dots, but it is limited to vehicles manufactured before 1959. I did a quick Google search and found about a hundred different opinions on where it started, so I can't say how they originated, only that its an old hot rodder gimmick that goes back many years. My guess is that the legislature in those states that allow the practice were sympathetic to the old time hot rodders who wanted to remain old school.

As for the "accent" lighting, ditto for Oregon. You're fine if you not moving, but they need to be turned off otherwise.
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Personal experience looking at the "old school" blue dot lights from behind: It greatly diminishes the effectiveness of the lights.  It gives the brake light a dim, purple hue.  Bright blue LED might stand out, but as Adidasguy says, probably illegal.