You probably are right gchart, without a mcu it would about have to be a dedicated led driver ic. Usually those have different value resistors for modes, one for each.
If the second one is a PAM2803 based driver the resistor value can probably be lowered to gain more output with a Li-ion or increased to lower the output.
The first one might benefit from a lower resistor also but now from gchart’s obversations, I’m not sure what ic its using. So it could go POOF! There’s only one way to find out. 
Thanks guys. Looks like the cf17 is probably the only option so I’ll give it a try.
I’ve used that driver before. Someone asked me about it a while back and here is what I had to say: I have used that driver. “I am pretty happy with it. The mode spacing is not ideal in my opinion. Low is about where I would like medium to be. You also have to wait a painfully long time before turning the light back on in order to avoid advancing to the next mode (like 5 seconds). The PWM is audible to me but I have pretty good ears so I’m not sure how noticeable it would be to most people. It is pretty noisy to me though. I don’t “see” it though. I have run it a fair bit on an 18350 and single Cr123s and had no issues thus far. I did not run it long on a single AA but I did some when outside of a host for testing the modes. It seemed to run great on it. For the price I am happy with it and don’t mind living with its quirks.
In short it does work with both small li-ions and cr123s. They have held up well for me but the memory and lack of lower low keep it from being a really good driver.
I hope that helps.
Is 10KK still white?10000K? That can’t white...
I see 10000K in 4th and 6th page. However it’s absent from 7th and 8th.
Ohh, yep - missed it. Dunno what it all means though, but it's odd. Hard to imagine cooler than 7500K and it's cooler by a lot.
Plus it's the lowest bin of any of the SST-40's KD has - N3, where the others are N4 and N5.
Hi friends
21700 P60 Style Flashlight Host is available now
KDLITKER E6(21700) P60 Flashlight Host
Enjoy
I must say that it is very goodlooking, just like the 18650 version. You must be the only one in the world still developing the P60 system?
Thank you for interesting with our product.
Yea, i will keep to improve and develop the P60 style products.
Maybe it has the heat dissipation and brightness weakness.
I like the P60 style flashlight is environmental friendly and dynamic.
You can just exchange the LED drop-in module and added some parts to enjoy a new light.
You don’t need to throw away a whole light.
That’s why i like the P60 style flashlight.
Hope you will like it too.
That is a very good looking P60 host. Will order it today. Thanks, BanL.
Thanks my friend
Thanks for the comment and let me keep improving. 
Wow!
P60 21700, at last...
I’m a big fan and this one will be used properly.
Thx BanL.
BanL, how about a P60 host for a single 18350 cell?
Like a new L2M?
This looks nice. Thanks for offering these. I’ll have to pick one or two up. Someone else mentioned an 18350 host/tube for the regular E6 and I’d be interested in that too.
NICE!
Thanks for keeping the P60 alive and up to date! It’s still a great platform for 95% of people IMHO.
I’ll be getting one of these 21700 hosts for sure!
Agreed!!!
Hi BanL.
JKK90 ?
I want to buy them from you.