H600c Mk IV 18650 XHP50.2 4000K High CRI Headlamp

Emitter: Cree XHP50.2 Neutral White — 4000K, 90+ CRI, 3-step tint deviation

Output & Runtime (ANSI OTF)
High — H1: 1616 lm, PID (2.5 hr) | H2: 1010 lm, PID (2.9 hr) / 579 lm, PID (3.1 hr) / 305 lm (5.3 hr)
Medium — M1: 147 lm (12.5 hr) | M2: 65 lm (27.5 hr) / 26.4 lm (2.7 days) / 9.9 lm (7.1 days)
Low — L1: 3.4 lm (17.5 days) | L2: 1.06 lm (2 mo) / 0.3 lm (3.8 mo) / 0.08 lm (5.4 mo)
Beacon/Strobe — 0.2Hz beacon at Low | 0.2Hz beacon at H1 | 4Hz strobe at H1 | 19Hz strobe at H1

Beam: 17° hotspot, 80° spill, orange peel textured reflector

Battery: Single flat-top unprotected 18650 li-ion rechargeable (not included)
Operating voltage: 2.7V–6.0V | Parasitic drain: negligible

Thermal & Battery Protection
PID thermal regulation on the three highest output levels | Continuous monitoring of temperature, current, and voltage | 2.7V low voltage cutoff | Reverse polarity protection | Auto step-down at low battery

Build
Unibody aluminum, precision machined from bar stock | Type III Class I hard anodize | Corning Gorilla Glass | Sealed and potted driver | IPX8 waterproof (2m, 30 min)

Dimensions: 0.95" head diameter × 3.85" length

Weight
Head only: 1.4 oz (39g) | With battery: 3.0 oz (84.6g) | With battery and headband: 4.4 oz (124.6g)

Other
Battery capacity indicator (4 clicks from off, LED flashes 1–4 times) | Electronic soft-touch switch | Proprietary heat sinking bonds LED board directly to unibody casing

Operations
This light has 3 main levels (High, Medium, and Low) and a beacon-strobe mode. Each main level can be programmed to one of its two sub-levels, and the second sub-level of each main level can be further programmed to different brightness levels.

Basic Operation
1 click — Turns the light on to High, or turns it off.
2 clicks — Turns the light on to Medium.
3 clicks — Enters beacon/strobe mode.
Press and hold (0.6s+) — Turns the light on to Low, then cycles through Medium and High. Release at the desired level.

Advanced Operation & Configuration
Press and hold to cycle from Low → Medium → High. The cycle always starts from Low regardless of your current level. Release at the desired level.
Double-click at any main level to toggle between its two sub-levels (H1/H2, M1/M2, L1/L2). Sub-level selections are memorized through power cycles and battery changes.
To program the second sub-level (H2, M2, or L2) to a different brightness: double-click 6 times at that main level to enter configuration. Each subsequent double-click cycles through available brightness levels. Single click to save and exit. Settings are memorized through power cycles and battery changes.

Battery Indicator — From off, 4 quick clicks. The main LED flashes 1–4 times to indicate remaining battery capacity.

Beacon/Strobe — 3 clicks from off to enter. Double-click to cycle through beacon and strobe options. Settings are memorized through power cycles and battery changes.

PID Thermal Regulation Temperature Programming
Applies to the three highest output levels. To adjust:

1. Turn off the light from H1, then turn back on to H1.
2. Press and hold to cycle from Low to High 6 times.
3. On the 7th (or more) cycle, release the switch at:
   High — adds 1°C (up to +5°C max)
   Medium — reverts to factory default
   Low — subtracts 1°C (up to −5°C max)
   

Mode Groups
This light has three mode groups: G5 (factory default), G6, and G7. From off, select with 5 clicks (G5), 6 clicks (G6), or 7 clicks (G7). Selections are memorized through power cycles and battery changes.

All mode groups share the same basic controls:
H can be either H1 or H2 | M can be either M1 or M2 | L can be either L1 or L2
From off: 1 click → H | 2 clicks → M | Press and hold → cycles L, M, H

G5
H1 fixed at 1616 lm | H2 programmable to 1010, 579, or 305 lm
M1 fixed at 147 lm | M2 programmable to 65, 26.4, or 9.9 lm
L1 fixed at 3.4 lm | L2 programmable to 1.06, 0.3, or 0.08 lm

G6 & G7 — All six levels (H1, H2, M1, M2, L1, L2) are fully programmable across 12 available brightness levels. Double-click 6 times at any level to enter programming mode. Double-click to go up one level, triple-click to go down. Single click to exit.

Factory Reset — Three consecutive 5-clicks (or 6-clicks, 7-clicks) from off resets G5 (or G6, G7) to factory defaults.