2x18650 Buck Driver With Two or Three Modes Low/High or Low/Medium/High

I'm looking for a reliable 2x18650 buck driver for a single XP-G3, either low/high or low/medium/high.

I am thinking something like 30 lumens, 250 lumens, 500 lumens,
or 30 lumens/250 lumens.

Something like 500mA and 3000mA (low/high)
or 100mA/500mA (low/high) would be ideal.

The host is a simple press for momentary, click for on, click for off flashlight, ending in "fire" and beginning with "Sure".

I've looked at the b3Flex, and while it could do LVP, low/high, low/medium/high, and operate around 88% efficiency,
since I only have one on/off switch, I could use it as a "dumb" driver only, with "Force" mode to 500mA or 750mA and one single mode.

If I cannot find a way to use a multimode buck driver, I may just spring for the b3Flex.

I want to be able to switch modes while the light is on.

Is there anything out there that will do this?

Preferably, I am looking for constant current, no PWM.

While the 7135 rules single cell applications, I am having a difficult time finding something to bring the 7.2V–8.4V of 2x18650 to feed a single XP-G3 with respectable efficiency.

http://www.mtnelectronics.com/index.php?route=product/product&path=67_115&product_id=521

http://www.mtnelectronics.com/index.php?route=product/product&path=67_115&product_id=395

http://www.mtnelectronics.com/index.php?route=product/product&path=67_115&product_id=357

I looked on their website but missed those.

Thank you very much!

Now I just need the perfect 2x18650 host to put it in. :thumbsup:

Wow, nice choices!

When I had similar requirement, I had to design and manufacture driver by myself!

If you're ok with a p60 hosted light the solarforce l2 d18 is nice. Just need to add a head and tail cap of choice. But this can only take a 17mm driver. Or a convoy l2 which can also take 2x26650