Im currently working on a prototype divelight using 4 x U-bin Lux3's slightly overdriven.
Approx 500 Lumens. about 140mm long and 75mm wide at the head. can use multiple types of batteries like 4x18650's ( protected or unprotected, aswell as smaller li-ion's), 1xC/D Li-ion, 4xAA/AAA ( Nimh, Primary or primary lithium ) and possibly some others. over 2 hours runtime with 4x18650's.
The prototype should be ready and tested by the end of next week.
Edit: I know it is not HID but i thought you might be interested.