[candle lamp]

Hongkong Zhuoye Technology Limited has been mainly dealing with OEM / ODM of flashlights for many years. They start to develop their own brand "Rayus" this year.

The PT10S is a high-output flashlight with a Cree XM-L2 U2 cool white emitter and a good circuit, featuring high performance and overheating protection, runs on 1x18650. There is another PT10 version available, with a neutral white emitter and a brushed stainless bezel ring.
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The light comes in basic packaging, and it comes with a user manual with warranty card, spare o-ring, tailcap rubber switch boot, cigar grip ring (attached), replacing ring for cigar grip ring, pocket clip (attached), wrist lanyard, and holster with closing flap.
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Manufacturer Specifications from user manual and Rayus website :
• Use cool white Cree XM-L2 U2 LED with a lifespan of 50,000 hours
• 151mm (Length) x 25.4mm (Diameter) x 40.5mm (head)
• 162g weight (excluding battery)
• IPX-8 (waterproof up to 2meters)
• Max. runtime of 260hrs (tested with 3100mAh Li-ion battery)
• Tactical flashlight with long throw, max. beam distance of 309m
• New digitally regulated circuit with high efficiency and stability, maintains constant brightness
• 4 output levels, quick access to Storbe, hidden SOS
• Intelligent memory function to remember the last output level used
• Hidden power indication to detect the remaining power anytime
• Low-voltage warning function to remind users of low power
• Intelligent temperature protection function to avoid overheating
• High accuracy metal smooth reflector
• Toughened ultra-clear mineral glass lens with double-sided anti-reflective coating and high optical efficiency, anti-scratch and shock-resistant
• The reliable stainless steel side button is to select output levels
• Tactical switch in tail, press it to turn on the light quickly
• Removable tactical ring/replacing ring, easy to hold in different environment
• Reverse polarity protection to protect damage resulted from improper battery installation
• Anti-roll and slip-resistant structure design, to prevent the light rolling on the smooth flat surface
• Stainless steel titanium-plated striking bezel, no dazzle, firm and shock-resistant, can protect the flashlight head well
• Powered by 1x18650 battery or 2x3V CR123A batteries
• Shock-resistant inner body design ensures the reliability and safety in the strong shock environment
• Made of durable aircraft-grade aluminum, premium Type III hard-anodized anti-abrasive finish



The above-mentioned Rayus product parameters are tested according to the ANSI standard in the lab with 3100mAh 18650 Li-ion battery. Data may vary between flashlights, batteries and environments.
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The hard (type III) anodizing is a matte black and consistent throughout with no chips or damage of other faults to be found on my sample. There are labels on the head only. The labels are not as bright white as some other lights, but that actually helps to make them less obtrusive. The knurling is present over battery tube and tailcap. The stainless steel clip looks and feels good. It holds onto the light very tightly. The clip works as a good anti-roll device.
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The light has 3 parts (i.e. head, battery tube, and tailcap).
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The light has a stainless steel titanium-plated crenellated bezel ring which is well cut and all edges are not sharp. The exterior of the head has 6 shallow scallops machined on it which serves well as an anti-roll feature. The head has cooling fins to help with heat dissipation. The light has the dual-switch control in the head and tailcap. The mode-changing side switch is electronic switch, with a more quiet clicking sound than other lights for this class. It has a reasonable amount of tension when pressed.

The distinctive aspect of the light is a built-in thermal sensor, and it will step-down from Turbo to High, if the temperature in the light exceeds critical temperature (~70C). A good safety feature, especially when running 2xCR123A on Turbo.
Another distinctive aspect is that PT10S will automatically enter into the lower output level when the battery power is not enough at current output level.
The light has a hidden power-indication function which is available only for 1x18650 Li-ion battery source. A Quick double-clicking the side switch when the light is on Low output level will show you the remaining power as follows :
- The light flickers one time to show the remaining power is less than 25%.
- The light flickers twice to show the remaining power is less than 50%.
- The light flickers three times to show the remaining power is less than 75%.
- The light flickers four times to show the remaining power is highly enough.

There is a spring mounted on the positive contact board in the head, so flat-top cells can be used in the light. The light has reverse polarity protection to protect from improper battery installation (i.e., the electronics of the PT10S has in-built reverse polarity protection). The negative contact ring appears to be a metal ring to give better resilience compared to a simple PCB contact.
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The light uses a double-sided AR coating lens, and the purple hue is reflected on it. The aluminum reflector has a smooth pattern. Surface finish on the reflector is perfect from visual inspection, with very fine radial machining lines running down the reflector cup, and well-centered XM-L2 U2 cool tint LED sits at the bottom of the reflector cup.
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The battery tube maintains a fairly clean look. Most of the body is covered by diamond-textured knurling which should provide more than enough grip. Knurling is a bit aggressive. The body accommodates my 2x(R)CR123A's and (un)protected 18650 cells without issue. Note that Rayus confirmed 2xRCR123A's can be used. They did respond that technically the user can use 3.7V two 16340 Li-ion batteries, but it seems likely they do not highly recommend those cells, because of the higher voltage & the lower efficacy (i.e., the capacity of two 16340's can not catch up with 18650's capacity on higher output levels of the light). The clip & cigar grip ring help enhance grip as well.
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The removable cigar grip ring is securely on the body end and it holds the clip. It can be removed after removing the o-ring on the body end first.
The battery tube has a notch on the body end where the removable clip can be attached. The clip is head-facing. If you don't like the bundled cigar grip ring attached, you can pull it off and change with the replacing ring.
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The diameter of the both ends of the battery tube is same, so head and tailcap can be reversed on the battery tube. It means the pocket clip is reversible without removing it from the original position. The wall of the battery tube is very thick (~3mm), the light feel very solid.
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Threads on both ends are well machined, with the those on the both end being fully anodized which allows the light to be locked-out when the tail cap is slightly loosened. There are o-rings which came generously lubricated.
Threads on either ends on the battery tube mate well with the head and tailcap with no issues of cross-threading or grinding. The screws threads are good quality trapezoid-cut.
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There are two wide slots for wrist lanyard attachments. The rear end is scalloped so that it would be easy to engage the switch.
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The tailcap switch is a forward clicky which allows for momentary activation. The rubber switch cap protrudes out the tail end (i.e., the light can't tailstand). The switch has nice stiff tension with average travel. There is a band of knurling on the tailcap.
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User Interface

Turn on-off by the tailcap forward clicky switch (press-on for momentary, click for locked on).
There are two modes (i.e., general mode & flashing mode).
On-off is controlled by the tailcap switch and output mode switching is controlled by the side switch on the head.

1) General mode
Output changing is controlled by the electronic side switch. Click and release to advance through outputs, which proceed in sequence from Turbo -> Low -> Med. -> High, in repeating sequence. The light has mode memory, and remembers the last output level used when you turn the light off and back on, even after a battery change.
Note that you cannot set the output level while the light is off. The electronic switch only works when the light is powered on by the tail switch first. As such, there is no standby current on the PT10S.

2) Flashing mode
The “hidden” Strobe, SOS are accessed by clicking and holding the side button switch for one second and three seconds respectively. A single press on the side switch will return to the memorized output level in general mode. The flashing mode has no memory.
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From left to right, VicLite 18650 (2600mAh) protected, Olight M22, Rayus PT10S, Armytek Viking Pro v2.5, Lumintop TD16, Nitecore SRT7.
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The head size & body weight excluding battery of four lights are as follows :
M22-41.0mm/148g, PT10S-40.4mm/163g, Viking Pro v2.5-39.4mm/161g, TD16-38.5mm/159g, SRT7-40.0mm/174g
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It is good size to hold and can be used as an tactical light. Overall grip is fine. Overall build quality is excellent,
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The light comes with a basic nylon holster with a velcro strap on the head. The light fits in the holster head-up only. It has a loop allows to carry it in horizontal position.
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Measured Dimensions & Weight

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PWM


No sign of PWM at any level of the light, leading me to conclude the light is actually current-controlled as claimed. I notice there is no buzzing sound at all output levels in my sample.
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Runtime

1. 1xVicLite 18650 (2600mAh) - Continuous Fan Cooling


Note that PT10S has a built-in thermal sensor which is a nice safety feature for the heavily driven lights on Max. output level.
There is, however, no thermal step-down on Turbo runtime, due to use of fan cooling during testing. Instead, fan-cooling runtime shows a slowly drop in output, and you can see a clear step-down pattern over time as the battery drain or near exhaustion (i.e., you will not be stranded in the dark without warning).
When the battery power is low at current output level, the PT10S will automatically enter into the lower level. There's a low-voltage warning function. When the battery is nearly exhausted, the light starts to flicker 3 times every 3 min on Low mode. This is a useful signal to tell you it's time to recharge Li-ion cell before over-depleting unprotected cell.
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2. 1xVicLite 18650 (2600mAh) - Initial Fan Cooling (4mins)


To find out the difference between continuous fan cooling and non-cooling on Turbo, I tried to use fan cooling just over the first 4 mins, but non-fan cooling for the rest of the runtime.
There is no difference in the runtime pattern, due to initial 4mins fan cooling, over the 12 mins. Beyond that time, the non-cooled runtime shows a definite drop off to High output level.
You can see a clear step-down pattern over time as the battery drain or near exhaustion like the continuous fan cooling. Note the PT10S no longer shows the abrupt shut-off as the light nears the end of the run, but may show the abrupt shut-down due to protection circuits being triggered first, in my view.
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3. Surface Temperature
1) Checking point


I measured with thermal probes attached to one point of the light for initial fan cooling (4mins) run. The room temp. was 28 degrees C, and window was opened a little in the test room. The resting temp. for the light before run was 29 degrees C. You can see the point on the light where the thermal probe was set in place as shown above.
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2) Measured surface temperature


Note that left y-axis is the relative output. The brown line represents surface temperatures of the light in degrees centigrade (celsius) should be read off the right y-axis.
The light steps down when the surface temperature at cooling fin reached about 53 degree C, and keeps the temperature within 52~53 degree C before starting to drop down to Med. output level.
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4. Output-Runtime Comparison on 1x18650 with Continuous Fan Cooling


The max. output on 1x18650 is higher than other lights in this class. It seems the PT10S shows very good efficiency and regulation on 1x18650. Note that like other highly-driven lights, the quality of cells is important (i.e., poor quality or heavily used 18650 cells may not be able to provide a sustained current at max. output level for intial runtime).
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5. 2xCR123A


It seems a doubtless fact that the high powered light driven hard at max. output may cause some CR123A batteries to eventually overheat and trigger their PTC (Positive Thermal Coefficient) protection devices. Here is comparison of same battery brand with different version, with continuous fan cooling.
You can see strange runtime pattern on the same Panasonic CR123A with two different version. The light on "Industrial" lithium cells shows that after 1~2 mins step-down and a few mins recovery phase on Turbo, the light dropped-off rapidly to 38% output, only to then fall out of regulation, started to recover output gradually. I think this runtime pattern is due to the PTC device kicking-in response to the temperature in the cells.
However, the light steps down to High after 3 mins runtime on "PHOTO" lithium cells. It seems this step-down isn't likely due to the PTC device kicking-in in response to the temperature, but due to the low batteries power from the shape of the graph (i.e., there is no recovery phase). These phenomenons aren't the issue of the light. This regulation behavior seems to be related to mostly heating up of multi cells, PTC devices, brand name, and different version of the same brand. So I recommend you don't run on Turbo output for extended periods on CR123A battery source in the light.
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6. 2xRCR123A (16340)


The light steps down to High after 2 mins runtime on AW 16340 protected cells. It seems this step-down is likely due to the low batteries power as well. There is a completely shut-off when the AW 16340 battery protection circuit kicked in.
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7. All Battery Sources


The PT10S is very slightly brighter on 2x battery sources than 1x18650.
Personally, one thing I would like to see is a lower Low mode (2~3lumens).
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Beamshot
1. White door beamshot (about 50cm from the white door) on max. output on 1x18650 (2600mAh) VicLite protected cell
- ISO100, F/3.5, 1/320sec, Auto white balance

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- ISO100, F/3.5, 1/800sec, Auto white balance

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- ISO100, F/3.5, 1/1000sec, Auto white balance


The light has a middle sized bright hot spot. The hotspot is well focused, perfectly circular with a defined edge. A corona surrounds the hotspot which makes the hotspot seems slightly wider than it actually is. The spill beam region is relatively dim compared to the hot spot. Beam quality is good, free from any noticeable artifacts. The beam has a typical cool tint.
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2. Indoor beamshot (about 7m from the target) on max. output on 1x18650 (2600mAh) VicLite protected cell
- ISO100, F/2.8, 1/4sec, Auto white balance

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3. 55m Outdoor Beamshot on max. output on 1x18650 (2600mAh) VicLite protected cell
- ISO100, F/2.8, 1sec, Auto white balance

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4. 60~65m Outdoor Beamshot on max. output on 1x18650 (2600mAh) VicLite protected cell
- ISO100, F/2.8, 1sec, Auto white balance

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As you can see, it seems that throw is very good for the class.
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* PT10S sample provided by Rayus for review.