Emitter: Three LEDs on a copper DTP MCPCB e.g.
Cree XHP50.2 3V LED,Luminus SST40 LED
Optic: Aluminum Orange Peel reflector
Lens: Glass with anti-reflective coating
Flux: ~10,000 lm(XHP50.2 3V),~7,000 lm(SST40)
Intensity: ~26055 cd ANSI throw ~325 m
Firmware: The FW21 pro uses free software called Andúril,
distributed under the terms of the GPL v3. Code is available from
User interfaces:  By default the FW21 pro is set to use SMOOTH RAMPING.
Instant access to TURBO mode is also provided.
 A more conventional STEPPED RAMPING UI is available if you
like discrete modes level. You can choose how many steps you want.
 MOMENTARY mode is useful for signaling purposes or rapidly/briefly
lighting up targets. To exit this mode, physically disconnect power
 MUGGLE mode uses a reduced output.
 It has an electronic LOCKOUT for safety, but acts also as momentary
low light.Other functions: Battery check, sunset, beacon,
tactical strobe, party strobe, bike flasher, candlelight, lightning storm
Battery: One flat-top or button-top 21700 cell. An unprotected cell is recommended.
Max. length 70.5 mm. Cell is not included.
Driver: FET+7+1 driver. Low parasitic drain while OFF
Body: Aluminum with hard-coat anodizing
Switch: Electronic tail switch
Ingress rating: Equivalent to IPX7
Weight: Approximately 120 g without cells
Size: 40 mm Ø head x 102 mm length.