Does Longevity Of An Led Equate To It's Color?

[Spin]

I am looking to purchase or make a single led light that will give me maximum duration for minimum voltage/current. I read that a blue led "may" provide me with the above? Possibly a blue led in series with 3 vdc without a regulator circuit or a resistor? Comments appreciated.

 

[greenlight]

it is not sure.

 

[Canuke]

I'd expect something from the red end to be what you want -- red uses the least energy per photon, hence its lower Vf. Blue is the most electrically efficient at this time I think, but it isn't the brightest color to the human eye.

More details might help: do you have power supply constraints? (1-cell, 2-cell, wallplug, solar)? Does it need to illuminate, or just be seen -- is it a nightlight, or a "find-me" light, or an emergency type of light where runtime is king, no matter the color?

 

[Spin]

I'd expect something from the red end to be what you want -- red uses the least energy per photon, hence its lower Vf. Blue is the most electrically efficient at this time I think, but it isn't the brightest color to the human eye.

More details might help: do you have power supply constraints? (1-cell, 2-cell, wallplug, solar)? Does it need to illuminate, or just be seen -- is it a nightlight, or a "find-me" light, or an emergency type of light where runtime is king, no matter the color?

My preference is as follows;

1. Either one Cr123 or 1-2 AA batteries. (non rechargeable)
2. Emergency light with ability to see 10 feet or more.
3. 30 hour minimum runtime.

Possibly a red led Gerber IU may do the above?