newbie question: differences between XHP vs XM/XP LEDs?

LED Flashlights – General Info
1

Have been reading around the forums. So far I've bought some flashlights based on the reviews/recommendations here (eg. the Astrolux S1, Convoy S2+/C8). So far they are using the XP-L LEDs. I notice that there are also the XP-G, XM-L which have some similarity and differences (eg. smaller or bigger size, more throwy or more floody). And also some for different company like Nichia 219B, 219C.

I've been reading some other flashlight reviews which appear to use a different series LED, XHP-something (XHP35, XHP50, XHP70). Are this XHP series more different than the above LEDs? What are the main differing characteristics? (hopefully in less technical jargon..)

2

XHP LEDs are multi-chip (4), connected in series for either “6V” or “12V”, vs single-chip “3V” for the others.

3

Xhp is quad core leds
Higher Vf
Have more power with same footprint

4

They are bigger, use more power, and produce more lumens.

5

Does that mean flashlights that use XHP series LEDs will typically have require more than 1x18650?

6

Not necessarily. Buck driver was the norm for flashlights but now boost driver is becoming common and growing advanced. With boost driver you can drive an XHP35 from a single Li-Ion battery.
Usually boost driver has lower efficiency compared to buck driver. Also bear in mind that boosting/bucking should be done as less as possible to get the most efficient system.
For example: boosting from 3,6V to 6V is better than boosting from 3,6V to 12V.
Almost all Cree’s favourite arrayed LEDs has option for 6V/12V except for XHP35 series, and unfortunately this is currently the star in flashlight world. I guess XHP35 HI is what drives the development of good boost driver fro single Li-Ion we enjoy today.

- Clemence

7

Yes, unless they use a boost driver, which is pretty uncommon.
Even if you do use a boost driver, a single battery will not last that long.