DRL BLUE in Califonia is it LEGAL????

In most jurisdictions it is illegal to have red or blue lights on your vehicle that is visible from the front of the vehicle unless it is an emergency or law enforcement vehicle.

 

No blue is not legal anywhere in the USA.

Daytime Running Lamps Permitted But Not Required on Passenger Cars, Multipurpose Passenger Vehicles (MPV), Trucks, and Buses
Daytime running lamp (DRL)
2 identically colored either white, white to yellow, white to selective yellow, selective yellow, or yellow
On the front, symmetrically disposed about the vertical centerline if not a pair of lamps required by this standard or if not optically combined with a pair of lamps required by this standard
Not more than 1.067 meters above the road surface if not a pair of lamps required by this standard or if not optically combined with a pair of lamps required by this standardSee S7.10.13(b) for additional height limitation.
Steady burning.Automatically activated as determined by the vehicle manufacturer and automatically deactivated when the headlamp control is in any “on” position.Each DRL optically combined with a turn signal lamp must be automatically deactivated as a DRL when the turn signal lamp or hazard warning lamp is activated, and automatically reactivated as a DRL when the turn signal lamp or hazard warning lamp is deactivated.See S7.10.10.1(c) for additional activation requirements when mounted close to, or combined with, a turn signal lamp.

EDIT:

The formatting above got screwed up because the forum doesn't support tables. Here is the info in a table. Source:



Standard No. 108; Lamps, reflective devices, and associated equipment. - Federal Motor Carrier Safety Administration

 

To succinctly sum it up, NO!
NO RED OR BLUE lights on the front of the car!
Unless you want a ticket.
Local LEO's are kinda fussy on this point!