Body: The main battery tube of the T100C2 is very similar to the P100C2 and has a diamond-textured knurling going round the front half of the tube. A flat surface is machined on the knurled area where branding text is printed. The entire light's clean cylindrical design makes it feel very comfortable when held in hand. Another difference from the P100C2 is the T100C2 has a grip ring which helps with holding the light in a cigar style grip and also serves as an anti-roll feature. This removable ring is not threaded but simply slips tightly onto the battery tube. Do take note that you will have to remove the rubber o-ring on the rear end before removing this ring. There is also a notch on the battery tube where the ring slips in, preventing the ring from twisting around. The entire light is finished in black Type 3 anodizing which is consistent throughout with no blemishes of other faults to be found on its surface. Overall, the T100C2 is also noticeably larger than the P100C2 to accommodate 18650 cell's, in addition to 2x 16340 and CR123 cells. All protected 18650 cells were tested to fit into the battery tube without problems. Threads on either ends on the battery tube are anodized as well and mate well with the head and tail cap with no issues of cross-threading or grinding. A single thick rubber o-ring sits behind both threads which provide water resistance. The tail cap houses a forward push button, allowing for momentary activation. The switching mechanism has an average amount of travel and resistance, and also provides a very positive tactile feedback and audible click when engaged. On the exterior surface, the tail cap is also covered in a good amount of knurling allowing for easy grip for battery changes. The rubber switch cap protrudes out the end of the tail cap so the light isn't able to tail stand, though this does mean that it's easier to press the switch.

Bezel/Head: At first glance, the T100C2 may seem no different than the P100C2 reviewed earlier. While this is mostly true in terms of design, there are some notable differences in terms of both form and function. The head has a 3-point crenellated bezel which allows for light to shine through when placed head down so you won't accidentally leave it on. The multi-coated lens reduces light transmission loss due to reflection on the glass. The T100C2 has a larger head than the P100C2 which houses a wider well-polished aluminum reflector behind the lens. Surface finish on the reflector was perfect from visual inspection, with some slight radial machining lines running down the reflector cup. The LED sits slightly off-center at the base of the aluminum reflector. The exterior of the head has a simple cylindrical design with most of its surface area covered in a knurling. Looking from the rear of the head we can see the physical reverse polarity protection employed by use of a raised ring around the "+" contact point. Around the outer radius is the spring-mounted metal ring which controls the Hi/Lo mode switching

Output: The EagleTac T100C2 provides a pretty straight forward user interface, especially when compared to all the multi-mode and variable brightness ramping modes of some recent lights. This will be a welcomed addition to some who just want a light that works without confusing the general user. With the head tightened the light is in Hi mode, advertised at 220 lumens. Loosened puts it into Lo mode, advertised at 55 lumens.

Compared to the P100C2, the T100C2 produces a tighter hotspot optimized for long distance throw. The beam profile is surprisingly clean considering the T100C2 uses a smooth reflector. Only minor artifacts are present around the relatively large corona right around the narrow hotspot, but this in itself isn't even noticeable during practical use. As mentioned earlier. the LED is slightly misaligned from with the reflector, this resulted is a noticeable skewed corona just around the hotspot. My sample has a slightly warm yellow beam tint on Lo mode and shifts to a cooler white on Hi mode.

As you can see from the graphs below, the electronics and driver in the T100C2 has been considerably improved over earlier models and provides excellent regulation over a wide range of input voltages from 3.7V to 7.4V. It also seems that it was specifically designed to run most efficiently on a single 18650 cell. Considering that a single 2400mAh EagleTac 18650 cell has 8.8Wh of power, while 2x Energizer e² CR123 cells have 9Wh of power, you would expect the 2x CR123 to produce slightly longer runtimes. However as shown in the graphs below, it's the contrary and a 18650 totally negates the use of disposable CR123 cells in this light. This is very good news since it saves you cost and also be more environmentally friendly without sacrificing output intensity or runtime. Output is maintained practically identical on all battery configurations. As usual, runtimes on 2x 16340 cells are much shorter than either of the other options, though regulation is still maintained very well.

Runtime:

Photo Gallery

Switch Rear	Switch Front	Switch Side

Batteries: For batteries, this light is approved by the manufacturer for use with two 16340, two CR123 or one 18650

To change out the batteries: unscrew the tailcap, drop out the old cells, place in new cells observing proper polarity. Reattach the tailcap and you're ready to go.

Accessories: Several accessories are included with the light. Inside the package you will find one Lanyard attachment ring, one Nylon holster with flip-top velcro closureand and two Spare rubber o-ringsr.

Picky Little Things:Nohing to report

Conclusions: The Good - Fit and finish is excellent. Very bright on Hi level for a pocket-sized light. Simple user interface with nice variation of Hi and Lo brightness levels. Tight regulation and provides very good runtime on 18650 and CR123 cells. The Bad - Noticeably skewed corona. Short runtime on 16340 cells. The Relative - Warm beam tint on Lo, slightly cooler on Hi mode. Uses a forward push button. Is not able to tail stand. Re moveable grip ring.

Quick Facts Table: