Emitter: 12 V Cree XHP35 High Intensity, neutral white, mounted on copper DTP MCPCB
Flux: >2000 lm
Intensity: >1 Mcd (ANSI throw >2000 m)
Firmware: Tom E’s open-source NarsilM v1.2
User interface:  By default the GT is set to use the very intuitive Narsil smooth RAMPING UI. Instant access to a 2.5 A
TURBO mode is also provided. A more conventional discrete level MODE-SET UI is available as an alternative. Anyone of 12 predefined mode-sets can be selected.MOMENTARY mode is useful for signaling purposes or rapidly/briefly lighting up targets.
Battery: Four or eight button-top 18650 cells (4S1P or 4S2P). Protected cells are recommended. Cells are not included.
Driver: 35 W, 2.5 A regulated buck driver with conversion efficiency that exceeds 90%. Parasitic drain while OFF is ~150 μA (~250 μA with button back-light on).
Reflector: 118 mm ID, aluminum, smooth finish
Lens: Glass with anti-reflective coating
Body: Aluminum with Type III hard-coat anodizing
Tripod socket: Standard 1/4 inch threaded (1/4-20 UNC)
Button: Tactile with back-lit rubber boot
Ingress rating: Equivalent to IP65, do not immerse in liquids
Weight: Approximately 1.8 kg without cells
Dimensions: 135 mm Ø head x 315 mm length
GT uses free software distributed under the terms of the GNU Public License version 3
GT Anduril code from toykeeper/flashlight-firmware