Up the front end sits a stainless steel bezel which provides additional protection from accidental bumps. This bezel isn't easily removable unless you have the appropriate tools to latch onto the notches along the inner side of the bezel, not that there's any reason to. Behind the bezel sits the usual sapphire crystal lens which is used in most of JETBeam's flashlights. The aluminum reflector has a medium grit texture which is consistent and well-polished. Alignment between the reflector and LED is almost perfect. Externally, the head has a rather simple design, mostly a smooth cylindrical shape. There're slightly raised bumps machined towards the rear end of the head which helps with grip if you ever need to unscrew the head for cleaning and such. You will not need to unscrew the the head during normal operation on the flashlight. The threads on the head are well done, perhaps just a little rough but nothing too bad, applying a little silicone grease helps. The threads are cut in the new style right-angle fashion which are thicker than regular threads and have sharp, rectangular edges instead of the regular smooth style. I noticed that the threads aren't coated in anti-oxidizing chemical like other JETBeam lights in the Pro series. The "+" contact is clean and nicely designed and you can use either button-top or old style flat-top 18650 cells.

The battery tube matches consistently with the overall sleek, cylindrical design of the flashlight. This will come as a nice change for users who didn't like the more aggressive designs of earlier Pro models. The exterior surface of the battery tube is almost entirely covered in diamond-textured knurling which provides an excellent and secure feel when held in-hand. The texture is not very aggressive as compared to those on SureFire lights for example. There are 3 flat faces, and 3 narrow recessed lines machined on. Threads on either end of the battery tube are thick and cleanly machined, though slightly rough as previously stated. A single o-ring sits on either ends of the battery tube for sealing against moisture. The tube is slightly thicker than most 18650 powered lights because it's walls are thicker. This is unlike some other manufacturers which simply modify their 2x CR123 battery tubes by boring a wider internal diameter to accommodate a 18650 cell. The tail cap has a band of knurling about 1cm wide. A reverse push button switch is housed inside the tail cap which doesn't allow for momentary activation, this is just as well considering the nature of the user interface. I notices that the extra switch module included seems to be of a different design than the one that came installed. The tactile feedback provided by the switch feels great and positive with average travel and tension. The installed rubber switch cap is of the "low-profile" style which allows to light to tail stand on flat surfaces and has checkered knurling on its surface. The spare switch caps included are regular style which will protrude out the tail cap when installed. Right at the end of the tail cap are 2 narrow slots machined on for lanyard attachments. The Type 3 anodizing is nice and smooth throughout the entire light, it has a slight dark gray-brown color. I did notice that the tail cap has a slightly more brown color than the rest of the light.

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

The JET-III Pro ST uses a Q5 bin XR-E emitter which is advertised as providing maximum output of 225 lumens on a 18650 cell. Beam profile has a medium sized hotspot area and spill beam with a bright corona just outside the hotspot. As expected, there's the typical dark ring-shaped artifact, common in many Cree XR-E based lights. My sample has a neutral white color tint, perhaps slightly cool in temperature when compared to sunlight. Output intensity good, but runtime is relatively short. Regulation is maintained quite well aside from some minor fluctuations which isn't noticeable in practical use.

Like all the current models from JETBeam, it has the infinitely variable brightness setting feature. In addition, it also has the strobe modes available as did the previous version of the JET-III. Any of the brightness levels and strobe modes can be programmed into 3 "slots" if you will. Referred to as Mode A, B and C and are arranged in the following order.

Off > Mode A > Mode B > Mode C

There is no memory feature as far as mode sequence is concerned, thus the light will always start on Mode A when first turned on.

Activating brightness ramping.
Simply half-press the switch 3 times within 1 second. The ramping always starts from 5% brightness, up to 100% brightness. As a reminder, the light blinks twice at 5% brightness, twice again at 50% brightness, and thrice at 100% brightness. When the 100% brightness level is reached, it cycles back from 5% brightness. Switch off the light for at least 2 seconds at the desired brightness levels and it will be set. No effects of PWM was noticeable even at the lowest 5% brightness level. There was also no high frequency noise unlike some other JETBeam models.

Activating strobe modes selection.
While in the brightness ramping mode, half-press the switch once. The light will cycle through all the available strobe modes in the following order. As with the brightness ramping, the sequence is cyclical. Switch off the light for at least 2 seconds at the desired strobe mode. Switch off the light for at least 2 seconds at the desired brightness levels and it will be set.

Ramps from 1Hz to 15Hz > Beacon > Double Blink > 100% S.O.S. > 5% S.O.S.

Reset settings.
While in the Strobe selection mode, half-pressing the switch once. The light will turn off although the switch is clicked on. Now, turn off the light for at least 2 seconds. The next time the light is turned on, Modes A, B and C will be set as factory defaults.

The Good - Output is regulated well. Good fit and finish with comfortable ergonomics. Stainless steel bezel provides additional protection when dropped. Convenient single handed operation for brightness and mode settings.

The Bad - Slightly below average runtime.

The Relative - Neutral white beam color tint. Uses a reverse push button. Is able to tail stand.

Head (front view).

Head (side view).

Head (rear view).

Battery tube (front view).

Battery tube (side view).

Battery tube (rear view).

Tail cap (front view).

Tail cap (side view).

Tail cap (rear view).