As far as I can tell
this is the only review of the Jetbeam SSA10 on the entire internet. This corporate cousin to the Nitecore EA series doesn't have as many modes, and you can't use the red LED as a moonlight-mode light, but the switches seem more robust and it has the latest XP-G2 emitter.
I will assume (for myself) that there are many other more...functional lights for the price and the form factor. As far as the runtimes go, they don't seem to add up on that review...Pretty sure runtimes low and medium are pure fabrication, or from bright to dim.
JUST for comparison sake, I have a klarus that runs on 2aa, and gets ~175 hours on the 3 lumen level. On 125 lumens it gets roughtly 2.7 hours. On max of 225 lumens, it gets about 1.25-1.5 hours MAX, all run on an xpg emitter. Even with the "20%" output of the xpg2, the numbers still don't add up.
I also have a Jetbeam rrt0, which i have run continuously on high (90-110 lumens tapered from remaining charge) for about 50 minutes before it blinked low voltage. on the equivalent of ~50 lumens, I get a little over 3 hours cumulative. on the lowest, (not tested) the manufacturer provides the runtime at 100 hours.
The SSA10 compared to the ea1 'cousin' dimensions: ea1 is shorter, but fatter at the head, but that gives it more throw.
Brightness and runtimes: Unless the ssa10 is capable of defying the laws of thermodynamics and general physics, there's no way the light can offer a maximum of 650 'lumenhours' while its cousin offers a more believable max of 200 'lumenhours.' Even the klarus i have offers a maxium of 525 'lumenhours', meticulously tested on 2AA's.
The one real edge the ssa10 may offer are the tactile buttons; they allow operation in very low light situations where relying on feel is key.
I might be wrong about every aspect I just posted above, but I guess I shouldn't judge a book by its 'lab-tested' cover.
To each his own!