wyager... AA Eneloop/Duraloop are good cells that will serve you well. But you won't get the most performance from the light with them.
With my D10 R2 I get about a 40-50% increase in output with 14500 li-ion vs. Eneloop AA. That's a pretty nice bump. You can expect a moderate to significant bump in output with most lights which can run both 1.5v or 3v lithium primaries as well as 4.2v li-ion rechargeables. The D10 has an input voltage range that can run on 1.2v-1.5v alkaline/lithium/Eneloop as well as 4.2v li-ion.
If you decide you want the most power output from your light, you will need to go li-ion and in that case, I would strongly recommend you only buy AW 14500 protected li-ions, as the Trustfire and Doubtfire and other xxxxfire brands, etc. are typically TOO LONG to run in lights like the D10.
And, of course, get schooled up on the proper use and charging of li-ion chemistry because it's very potent technology that demands proper usage and charging. Visit the Batteries section of the forum for info.
Once I found how amazing li-ion powering could be, that's all I run in all of my lights. And remember another benefit of running rechargeable cells (li-ions, Eneloops, etc.) you can start out with a fresh battery every day, unlike primary cells which are weaker and weaker and weaker every time you run them... until they must be discarded/recycled and replaced. Over and over and over again.
If you like to use and play with your lights a lot... rechargeables make the most sense. For those who don't know much about these powering options, there is a lot to learn and understand... get to the Batteries folder and get schooled up!
Li-Ion 14500 gives the highest performance in AA lights that can run them. AA Eneloop is a very good second best.
If you must run primaries, lithium L91 is the only way to go, in my view, as alkalines are poor performing and can tend to leak and ruin your expensive light! But supporting a steady diet of L91 consumption can get expensive. And remember, every time you use the light, you're using a battery that's weaker than the last time you used it. But not necessarily too weak to use... so you're kind of in a grey area there.