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Body: The battery tube has 4 flat faces machined towards the front half with some checkered textured knurling. The rear half of the battery tube is slightly slimmer which allows for better grip when holding the light in a cigar-style grip. The Type 3 anodizing has a smooth black finish and is consistent all over. The I25 has a pocket clip attached towards the front end of the battery tube which allows the light to be carried head-up. The clip is held securely in place by a retaining ring. There is also a notch which the clip sits in which prevents the clip from twisting around. The clip is very stiff and will provide a secure hold on even the thinnest material. The tail cap houses a forward push button which is stiff, has average travel and provides a very positive clicking sound when engaged. The rubber switch cap sits slightly protrudes out the tail end so the I25 isn't able to tail stand, though on the other hand makes the light easier to switch on. A band of checkered textured knurling is machined around the tail cap which provides grip during battery changes. I did notice that there is a slight gap between the battery tube and tail cap when it's fully tightened. 
Bezel/Head: The head of the I25 has a smooth bezel up the front, behind which sits an AR-coated glass lens. The reflector cup used in the I25 is unlike the others in the I-series. Instead of the half textured, half smooth reflector, the I25 has a medium textured aluminum reflector. The reflector finish is good having a well polished surface with no blemishes or imperfections to be found. The LED sits perfectly aligned at the bottom of the reflector cup. The exterior of the head has 6 slots machined on it running down length-wise. Towards the rear end of the head is a thin band of checkered knurling for grip. Threads on the head are well cut and cleanly finished, they mate perfectly well with those on the battery tube with no issues of cross-threading or grinding.
Output:Instead of having pre-defined brightness levels, the Olight I-series uses twists of the head to smoothly ramp its brightness level up or down. The direction of ramping alternates each time you loosen the head. To set the brightness level, simply tighten the head when you reach a particular brightness level during the ramping sequence. The I25 uses R2-binned LED's providing an output range of 6 to 205 lumens, taking about 2.5 seconds for a full ramp sequence either way. The digital current regulated circuit provides constant light output on all brightness levels with no signs of PWM flickering. You can also activate strobe and S.O.S. modes by half-pressing the switch within 2 seconds each time.
The color temperature on my sample leans slightly towards the warm side. The beam profile produces a well-focused hot spot with a bright corona. There are some ring-shaped artifacts within the spill beam, though aren't really noticeable during practical use. Regulation is maintained well throughout the battery life before dropping sharply towards the end and runtime is average.
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Level
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Lumen
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Lux
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Runtime hrs. (advertised)
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I25 low
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6
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64.583
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80
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I25 high
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205
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2206.601
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1.5
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Strobe
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SOS
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Switch: The switch is a rubber covered clickie and is fully recessed in the tailcap which allows the light to stand on end and be used as an electric candle. Despite the fact that the switch is recessed, it is very easy to use. Click on, click off. You can lock-out the switch by unscrewing the tailcap 1/2 turn. This will prevent accidental activation when packing the light in your backpack or luggage.
Batteries: For batteries, this light is approved
by the manufacturer for use with two 2x AA 2000mAh.
Accessories: Several accessories are included
with the light.
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China