I preparing to design a new LED for newly designed 14500 flashlight. Could you please share your preferences for the color temperature and type of LED?
How about long-range LED?
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SFT40 5000K is a good choice.
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We’re very glad to have you here, EdolucLight!
Yeah, SFT40 for long-range, though I prefer warm white.
If you’re willing to give up some throw the SFT70 is also nice though most BLF members probably like the SFT40 more.
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SFT40 or SFT70 is more suitable for use in 18650 and 18350 flashlights. 14500 cannot showcase its optimal performance. Recently, I’ve been testing a new LED, SFT12, which might be a promising alternative.
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At least one with no green tint, and a well-known emitter instead of random unknown Chinese one without datasheet would be good.
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Okay, good to know! 
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It would also be great to have an alternative that is NW and high-CRI, such as the 519a in 4500k, as well as CW in the 5700k variant, assuming your SFT-12 is anything like the one that was tested by Koef3.
Personally, I would prefer the 519a, dedoming the 5700k version of the 519a gives a lot more throw too, just a bit less than an XP-L HI when accounting for the output loss of high-CRI. Dedoming also gives it a neutral CCT (around 4200k in a reflector) with an often-desirable rosy tint.
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When it comes to 14500 flashlights, I think the 519A or XPL-HI are great choices depending on your needs. Personally, I’ve bought a lot of 14500 flashlights, and I always go for the Nichia 4000K without a second thought. 
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Yes，Nichia 519A and XPL 6500K is a good chioce.
Yes it is.
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