Anyone want to take a poke at this?
4.5-14Vin 0.59-6Vout 10A
http://www.digikey.com/product-search/en?keywords=NQR010A0X4Z
Bigger brother but might not fit in a host unless it’s a HUGE multi-emitter host w/ ALOT of driver space…but at 20A…boy howdy!
http://www.digikey.com/product-search/en?KeyWords=NSR020A0X43Z
Heck…here is the whole series…up to 60A!!!
For $8 I’ll add a few to my next DK order, you know I’ll have to trace the board and remake it in pretty purple with my choice of MCU (10F322).
If it has modes…let me know how much man 
How can they take that much heat just by stitting in the air and FR4 board? the small one at 60W.
I saw being mentioned about "Output Voltage Programming " from 0.59 to 6V So no constant current mode output?
Thats funny. I was just looking at those last night.
EDIT: I was unsure if we could use pwm for modes or we needed to use something more exotic that varies resistance (Trimpot) in electronic form. Or find a host that takes a trimpot of course.
You can use a trimpot for adjustable volts, or a fixed on the TRIM pin to ground for a constant voltage (I stumbled across these when investigating vaping box mods)
Feed the output thru a MOSFET BLF direct drive and voila
I did not look it over properly. But I was unsure if the unit will not self destruct if output is not connected or PWMéd. Some stuff does not like that. At all!
EDIT: I was also aware that a trimpot would work. But perhaps we should look at building an electronic trimpot that changes a pwm signal into a resistance. That would be the route I would consider. If I was to consider anything.
Dang …… been sitting on a big red pt121 and looking for a possible driver. Not driver savvy but would it be possible to mod a 40A to 30A? Thought about using a HID 85W for a host. Been running the big green PT120 DD in a 4D maglite with NiMH.
I understand they are very popular in Colorado and Washington state these days… :party:
That’s funny too because I just found out that our club has a very similar driver, the PTH08T210W from TI.
Here’s the datasheet. Unfortunately it’s a little too complicated for my needs.
@ warhawk: Yes exactly. Though a few of those you linked are quite large physically. Anyhow I have all too much on my plate right now to look into it for any length of time.