Tail light Blue Led

Hi guys, happy new year all...

thinking that the blue Led is more visible at night will be ok or legal using it?

thanks

I don't know where you live, so I can't comment on whether it is legal.

However, the international standard calls for red lights on the rear of vehicles. If you want other traffic to know that you are riding a bike (and not a stationary device, or an emergency vehicle), it's a very good idea to make your taillight red.

In the United States, blue is reserved for emergency vehicles, and you can get in trouble for using blue lights (IIRC).

If you want to be better seen and also identificated as driving bicycle, get an bright or very bright rearlight.
Here are a few bright ones:
Cateye Rapid X3
Knog Blinder MOB Mr Chips V
Specialized Flux Expert Tail Light
Orfos Red Flare

Thanks Angerdan, I already have a red tail light, I mod a trustfire cheap 18650 based with a red cree led. I just want to add a extra light for be used along with or without the other one

If you are looking to augment an existing rear red light with something complementary but different, I think you'd be best off using an amber LED. That at least is pretty close to the standard (and legal) red, and I understand can be more visible in some more difficult circumstances (fog etc). I still have a Vistalite modified by a CPF member (or maybe it was someone from BikeCurrent) which mixed red with amber LEDs very effectively. Blue (or any other colour further down the spectrum from red) would, I think, be a mistake as well as being illegal just about everywhere that traffic use is covered by national law. Amber mixed with ref generates a very noticeable fierce colour.

Savvas

Perfect explain... Thanks