I've had a couple of lights with two 18650 batteries and now I find them too big, as I want my light in a Goodman handle so my hands are free. Also 4000 lumens sounds too bright for recreational diving needs except perhaps for a wide angle video light.
I think the 4000 lumens might be a huge stretch, I picked up an Archon 4000 lumen light that's identical to the DGX in brightness.
Right. But, even if it's only 1000, it's still more than the DGX 600, for the same price, and includes 2 batteries, where the DGX only includes 1. And those batteries are $16 each from DGX. And it has multiple power levels, unlike the DGX. The big question in my mind is what is the beam angle on it?
Second, I don't want a narrow beam - you miss way too much. Might be OK in a cave or wreck but not for me in open water.
If you're on a night dive, I believe you need a light you can use for signaling. My experience is that a wide angle beam is not ideal for use as a signaling device. At least, the one time I was using a 60 degree beam and trying to signal my DM that I was down to 2000 psi (as he requested I do - we were in a cenote - i.e. a cavern dive), he looked right at me and didn't "get" my signal.
My conclusion is that for the Rec diving I want to do (which includes normal, warm OW dives, night dives, and an occasional cavern dive or visit to a wreck - all with the possibility of using my GoPro for pictures or video), I should have a decent spot light AND a decent flood (video) light.
Thus, I decided on the DGX 600 for $50 and the Mako 890 video light, for $73.
MAKO Underwater Photo/Video Light
They both use 18650 batteries which was also a selling point for me.
The Mako light is a 110 degree beam, which matches up almost identically with a GoPro field of view when it's in Wide mode.
That said, I haven't ordered the Mako yet and now I'm holding out for more info on that 4K lumen light that Roatan Joe posted about. If it's sufficiently wide angle, I may get that instead.