All the HDS run the same amp draw on high.
Good to know. Have a test set-up to test my current IMR Efest 700mAh batteries in three lights simultaneously - the Nichia 219b 4000K, the Nichia 219c 5700K, and the NLT 325 lumen light. Temp in the room is 72 degrees F with a fan on high pointed at the heads of all three lights.
From what I have read the IMR's are good at passing lots of current without getting hot while the HDS INR pass less current but last longer. If these Efest IMR's last less than 70% as long (53 minutes) compared to the HDS INR's at 1:15 minutes on level 23 I may be switching. My definition of lasting is time it takes to step down one level to level 22. I may have to perform this test multiple times as I am working and might miss the step down.
Results:
With the 700mAH Efest IMR batteries in the HDS flashlight at level 23 with burst enabled - so I started at level 24(Max), it took the following time for each light to drop down to level 22 with the following voltages, respectively:
Nichia 219b 4000K: 1:00 (60 minutes) at voltage 3.35V
XP-G3 5000K: 1:07 (67 minutes) at voltage 3.33V
Nichia 219c 5700K: 1:25 ( 85 minutes) at voltage 3.40V
My take away is that these 700mAH Efest IMR batteries last a respectable amount of time in the HDS lights at Level 23. The HDS 700mAh INR batteries will probably be more consistent in their run times and last longer on average.
To obtain a tighter sample of average run times would require more testing. This single test was enough for me to answer my basic question on run times of the Efest 700mAh IMR batteries in a HDS light.
Edit Add:
Did some additional testing on the Efest 700mAh IMR batteries by testing three different batteries (#7, #1, and #3) in each of the three HDS lights. I found that the run times are fairly consistent and all more than one hour. Additionally, I found that my Nichia 219c 5700K is more efficient than the other two emitters tested. See below:
I decided to purchase four HDS INR 16340 batteries for three reasons. First, they will likely have slightly longer run times. Second, Henry and Dan picked them so I trust the batteries more than the Efests. And, third, during the Spring and Summer months I go through a fully charged 16340 each and every day so they will get lots of use. I move to the HDS 18650 Sanyo batteries during the late Fall and Winter when the days are shorter and I found I was going through two 16340 battery changes daily.