Visible illumination in daylight

Are there some colours of light that are more visible in daylight than others?
For example, if I was outside during the day and I illuminated several LEDs of the same brightness, but each had a different colour, which one would be the most visible?

(I'm a newbie, so go easy :mecry

dont think theres anything stronger then the giant ball of fire in the sky...

you can try blue light. our sun emits lots of red and green rays. or was it balanced?

davidclayton said:

if I was outside during the day and I illuminated several LEDs of the same brightness, but each had a different colour, which one would be the most visible?

Click to expand...

Um... if the LEDs aren't in a forest, and there is someone there to see how bright they are, the one that was flashing.

:welcome:

Lumens is a scale adjusted for the human eye's response. Invisible infrared and ultraviolet have 0 lumens regardless of power for example. The human eye responds strongest to green, producing the greatest visibility per mw of light.

So for 50 lumes of red, green, or blue they should all be similarly "visible" in theory at least. However, you'll find green LEDs produce more lumens per device. That's largely because the optical power in mw is similar yet the human eye response factor scores green at more lumens per mw.

And yet the green LEDs are (when I last heard) still lagging behind the others in efficiency.

It's an interesting question. I don't think that any one color has a natural advantage, I think it would vary with the situation. A color that tended to match its background should be less noticable, one that contrasted more noticable.