I just saw that Dive Gear Express has added 2 new lights to their offerings and they are both "constant output".
The DGX Gears 1000-6 and 1000-8.
They are nearly identical. Both use a single 21700 battery for power.
The -6 uses a Luminus SFT-40 LED for a raw output of 2000 lumens (on high), with a smooth reflector and a 6 degree beam angle. 90 minutes burn time on High, 168 on Medium (900 lumens), and 600 minutes on Low (250 lumens).
The -8 uses a Cree XHP50.3 LED for a raw output of 3000 lumens (on high), with an orange peel reflector and an 8 degree beam angle. 60 minutes burn time on High, 120 minutes on Medium (1100 lumens), and 600 minutes on Low (350 lumens).
Both lights are selling for $89 each, which includes 1 battery. The battery has a built-in charger - just connect a USB-C power source.
www.divegearexpress.com
For comparison purposes:
A Dive Rite CX2 uses a Luminus SST-40 (not SFT-40) LED and a 21700 battery. It is NOT constant output. It is a max of 1700 lumens and 165 minutes on high (gradually tapering brightness). It is an 8 degree beam (with a smooth reflector).
A Dive Rite LX20+ uses 4 x 18650 cells and has a Cree XM-L2 U4 LED with a constant output of 1500 lumens (on high), in a 6 degree beam, for 135 minutes.
A 21700 cell is normally 5000 mAh.
The 18650 cells used by DR are 3500, so 4 of them is 14,000 mAh.
I was curious regarding the difference between a Luminum SFT-40 and SST-40. I found the following which suggest that the SFT-40 is a slightly improved SST-40.
The DGX Gears 1000-6 and 1000-8.
They are nearly identical. Both use a single 21700 battery for power.
The -6 uses a Luminus SFT-40 LED for a raw output of 2000 lumens (on high), with a smooth reflector and a 6 degree beam angle. 90 minutes burn time on High, 168 on Medium (900 lumens), and 600 minutes on Low (250 lumens).
The -8 uses a Cree XHP50.3 LED for a raw output of 3000 lumens (on high), with an orange peel reflector and an 8 degree beam angle. 60 minutes burn time on High, 120 minutes on Medium (1100 lumens), and 600 minutes on Low (350 lumens).
Both lights are selling for $89 each, which includes 1 battery. The battery has a built-in charger - just connect a USB-C power source.

Secondary Dive Lights
Diving LED Lights from Apeks, DGX, Dive Rite, Kraken and Mares XR. Brighter than previous generation canister lights, these are top quality handhelds for demanding sport diving applications. Most are excellent choices as secondary backups and in some cases even a primary for shorter technical...
For comparison purposes:
A Dive Rite CX2 uses a Luminus SST-40 (not SFT-40) LED and a 21700 battery. It is NOT constant output. It is a max of 1700 lumens and 165 minutes on high (gradually tapering brightness). It is an 8 degree beam (with a smooth reflector).
A Dive Rite LX20+ uses 4 x 18650 cells and has a Cree XM-L2 U4 LED with a constant output of 1500 lumens (on high), in a 6 degree beam, for 135 minutes.
A 21700 cell is normally 5000 mAh.
The 18650 cells used by DR are 3500, so 4 of them is 14,000 mAh.
I was curious regarding the difference between a Luminum SFT-40 and SST-40. I found the following which suggest that the SFT-40 is a slightly improved SST-40.