combining 2 white and 1 blue LED = What color output?

[mds82]

I am looking to make myself a very cool colored light using 3 XR-E's. I dont know if there are any calculations out there that i could use, but i would like to combine 2 White LED's and 1 blue LED to make about a 10,000k - 15,000k output range.

Assuming i am using a 2 White XR-E Q5 WG Tint LED's what do you think i would need for the Blue XR-E to create that kind of color range? I Would love to wait for a WA Tint to become available, but those are so far off right now

 

[nerdgineer]

Not to be silly, but...bluish white? The part of the spectrum white LEDs are thin on is at the red end. A warmish LED might fill in the combined spectrum better if you want improved color rendition.

 

[jtr1962]

It sounds like the original poster isn't interested in color rendition. To me this sounds more like a "mood light", in much the same way yellowish 2700K incandescents are essentially mood lights. Neither is very good if you're doing any tasks where seeing clearly or color rendition is actually important, but then that's not the function of all lighting. I personally find the idea of going towards the very blue rather than very yellow for mood light to be intriguing. Bluish light is very relaxing, so long as the tint tends towards blue to blue-green rather than violet. Violet tints are obnoxious.

 

[jtr1962]

I forgot to add that the ratio is probably closer to one blue Cree per 3 or 4 whites to get the effect you're looking for. One blue per two whites is probably closer to 20000K. I remember doing some experimenting with 5mm LEDs combined with ambers, reds, or blues to arrive at different color temps. One blue per 3 or 4 whites gave what looked like 10000K to 15000K. The "Tokyo blue" ones (~495 nm) gave the best effect.