The C2H is currently the smallest flashlight by DereeLight and the first designed for pocket carry. It has a a smooth bezel up the front, behind which sits a GITD (glow-in-the-dark) rubber o-ring. The lens is made of toughened, double AR-coated glass for optimal light transmission out the front. The C2H come with a textured aluminum reflector by default, but the package also includes a smooth reflector which can be swapped in place of the textured one depending on your preference/needs. Take note that you will need a fine-tipped pair of pliers or tweezers to remove the LED module and swap the reflector. From the rear you can see the PCB which contains all the electronic components and LED. There's a very low-profile spring on this PCB for the "+" contact of the battery, this helps is preventing the loss of electrical contact when the light is subjected to hard knocks and such. The exterior of the head has two fine bands of knurling at the front which provides adequate grip when unscrewing the head for battery changes. The rear half of the head has a series of fins which serve more of an aesthetic part than anything, though they also has four flat sides machined on which serves well as an anti-roll feature. The entire head is very well made and finished perfect machining cuts and consistent Type 3 anodizing throughout its surface.

The second half of the C2H is it's battery tube which also houses the switch module, it does not have a separate tail cap. As with the head, machining and surface finish, which has a slightly grayish-brown hue, is excellent with no flaws to be found. Threads on the front end mate perfectly with the head with no cross-threading or grinding encountered during tests. The threads are also anodized which allows the light to be locked-out to prevent accidental activation by simply loosening the head. Two rubber o-rings sits just below the threads, they fit very snug when the head is screwed on and should no doubt provide a very good moisture seal. Though you may want to apply some lubricant to them before use since they come dry. The exterior of the battery tube has a plain, cylindrical shape. The rear end is slightly raised which makes it more comfortable when held in a cigar-style grip. A non-removable clip is attached to the battery tube which allows for head-down carry. The clip is very stiff and provides a secure hold. The switch cap sits slightly recessed within the tail which allows the light to stand on its tail, a nice touch was added with the single scallop cut into the side which makes the switch more accessible. Do take note that while the C2H uses a forward push button switch, momentary activation for signaling and such is not practical due to the way the user interface works. There're also two small holes for lanyard attachments at the end, just above the clip. The switch has average travel and is stiffer than average, this may be a good or bad thing depending on your personal preference. It engages with a tactile and audible clicking feedback.

If you're unfamiliar with any of the terms used in this review, click here for explanations on common flashlight related vocabulary.

The C2H is a pretty straight forward multi-mode light, capable of four brightness levels in the following sequence:

Off > 1% > 5% > 30% > 100%

Cycling through modes is done by half-pressing the switch within 1 second. When left on any level for over a second, that level is memorized. The C2H uses PWM for the lower levels, the frequency of the PWM is very high and you will not notice any signs of it unless you intentionally wave it pointing towards you. Also, it does produce a subtle high pitched sound, very soft at 1% and increases towards 100%.

Note: Previous versions of the C2H came with a battery protection circuitry enabled by default. The sample reviewed is the third iteration of the circuit which has the battery protection circuit disabled by defaults. This protection circuit applies only when using unprotected 3.7V 16340 li-ion cells.

The beam profile produced by the C2H depends on which reflector you install. As expected, with the textured reflector, the beam profile is smooth with less artifacts. While with the smooth reflector it is slightly more focused with a brighter hot spot, but also introduces more ring-shaped artifacts into the beam profile. The color temperature of the light on my sample is slightly cool when compared to sunlight white.

As you can see from the runtime graphs below, the C2H struggles to maintain regulation at 100% brightness level, but to be fair, it outputs a significant amount of light. On the other lower levels, regulation is maintained very well, through runtime is noticeably short.

The Good - Excellent fit and finish. Comfortable ergonomics and well thought-out functional design elements.

The Bad - Short runtime.

The Relative - Beam has a slightly cool temperature. Uses a forward push button switch but not suitable for momentary activation. Is abel to tail stand. Clip for head-down carry.

Head, smooth reflector (front view).

Head, textured reflector (front view).

Head (side view).

Head (rear view).

Battery tube (front view).

Battery tube (side view).

Battery tube (rear view).