Review : KDLITKER C8.2 , 1*18650 xhp50.2 flashlight

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giorgoskok
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Review : KDLITKER C8.2 , 1*18650 xhp50.2 flashlight

KDLITKER C8.2 XHP50.2 Review

Overview :


First Look / Unboxing :

Flashlight comes in a simple brown box :

Package Contains :
- Flashlight
- Lanyard
- Spare o-ring
- Gitd tailcap boot
- Soft cleaning cloth

Extended View :

The flashlight itself :

As you can see , it is a classic C8 styled flashlight . Here are some more photos :

It has KDLITKER logo on one side

And the C8.2 on the other

Anodizing is matt , and has a nice feel…

It’s head , with great machining and some cooling fins :

It has a little “Warning” logo on the head . I find it funny , if you think that it is on a flashlight Silly :

Notice the nice crenelated bezel too

Here we can see the SMO reflector and the nicely centered LED (xhp50.2) :

One more photo coming soon , sorry

The tube . Very smooth knurling , and nice machinng also here :

The tailcap . It has holes for lanyard and has the rubber boot “protected” (not protruding) :

https://i.imgur.com/dWJQGtV.jpg

Tailcap’s rubber boot :

And the tube’s threads , on the tailcap side . Anodized , well machined :

The other side has bare non-anodized threads for better electrical connection

The visible part of the pill , with the driver and it’s spring (+) :

A button top battery has a good fit , even if it seems to be protruding a lot because of the long driver’s spring (it compresses nicely)

A quick teardown :

Head , tube , tailcap :

As someone can notice , on one of the tube’s “end” (flashlight’s head side) it has only 2-3 full threads , but connection between body and tube is very solid

Switch’s spring :

And the switch assembly . It has the classic little reverse-clicky Omten switch:

Head assembly :

Pill made from brass , with the xhp50.2 on 20mm KD DTP copper board :

And with the centering ring on :

Bottom side , with the driver held by a retaining ring :

Pill accepts 20mm driver and driver installed is H1-A

Modes and driver info :

Driver is the H1-A boost driver . Here are some info :

Input Voltage: 3V – 4.2V

3 Volts is the cut-off voltage , the LVP kicks in

Output Voltage: 6V – 6.8V max.

Output Current: 2900mA – 3000mA max.

Modes: Very Lo(5%) > Lo(35%) > Med(65%) > Hi(100%) + Hidden Strobe: Double Click

Features :
1. Constant Current, No PWM
2. Low Voltage Warning: When voltage is below 3V, it will keep flashing.
3. Memory function : ( On for > 3 secs)

Notes: 1. The driver does not have battery reverse protection. Please make sure the battery is connected in the correct way (positive end on the head side) . 2. The max current from battery can be up to max. 8A, high drain battery is recommended for this driver.

Measurements :

Battery used in all measurements : Sanyo NCR18650GA 3500mAh

Amperage draw (Measured on the tail , with UT139 clamp meter) :

Very Low : 15 mA
Low : 0.365 A
Med : 1.3 A
Hi : 4.7 A

Lumens (measured in diy lightbox) :

Very Low : 9.2 lumens
Low : 240 lumens
Med : 765 lumens
Hi : 2040 lumens (Theoretical value is 2120 lumens for xhp50.2 at 3amps)

Current @ the emitter will be updated soon

Intensity on highest setting : 32.2 kcd

Beamshots section :

Here are 2 quick beamshots , more coming tomorrow !

Low :

High :

Camera shows the corona a bit more yellow than it really is…

Here are some better beamshots finally !

Control shot :

Low :

Mid :

High :

As you can see hotspot is pretty big … Output on high is impressive , 2k lumens reaching a great distance!

Runtimes :

High mode (referred as Turbo) :

A few words :

Coming soon…

Flashlight was provided by Kaidomain for review purposes . You can find this flashlight here .

Edited by: giorgoskok on 08/05/2017 - 16:37
giorgoskok
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Reserved !

I still have to add a thing or two Wink

8/5 – Updated beamshots

Tangra
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Nice review George.
It is interesting how much is the battery current and voltage after 20 minutes on high mode?

EasyB
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Thanks for the review. The XHP50.2 in combination with the H1A boost driver is impressively efficient. The same combination and results that djozz found in the KDIY KF8.

The throw suffers though, from a combination of the low current density and new cree flip chip design LEDs, which inherently have less luminance and throw.

Speed4goal
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Thanks for the review. I want this light or at least the driver. Its crazy that 2k lumen single cell c8s are a ordinary thing now. With this set up or 3v its over 2k and with the XP-L2 it’s over 2k as well. I think this driver with a mtg2 would work nice in a c8 with a single cell.

Ollie
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George,

One thing I have to point out: The advertised driver percentages do not match the flashlight, or the driver, either. That medium is not 65%. Your current and lumen measurements seem to match, 35%, no criticism intended. But KD's advertised numbers may be from a preproduction driver. I like third gear. Why not give me 50%, split the difference? 8^)

Ollie

timbuchanan
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Great review

Ollie
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EasyB,

Why not do this like a car headlight, a recoil thrower. Position the forward reflector so that none of the light escapes. Capture all of the light, and shape the regular reflector to give the beam pattern you desire. I've been thinking about Wavien collars. They look a lot like a regular optic with the emitter hole bored all the way through,and inverted over the emitter. I think beam pattern is all about redirecting the light emission into the shape we desire, rather than any inherent emission angle of the LED.

Ollie

BanL
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Thank you for the review.

Enjoy Big Smile

kaidomain.com KD - LED Flashlights, DIY Parts and Accessories

Inquiry for KD, please feel free to contact me.

mrheosuper
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2000 lumen highest with just only 4.7A, doubt it !!!

Forgot my pen

doubleone44
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mrheosuper wrote:
2000 lumen highest with just only 4.7A, doubt it !!!

Why? The battery voltage under load should be about 3.8V, using a good battery, so this means about 3.8 V *4.7 A = 17.86 W input into driver, with the 90% efficiency of the H1A this means 0.9*17.86 W=16.074 W to the led, and cree lists 2654 lumen with the 18W max input, taking this into account, and 10% losses from reflector/lens, expected lumens are 2654 lm/18 W*16.074 W*0.9 = 2133.02 lm, so above the 2000 lm at startup.
(Correct me if my math is wrong)

mrheosuper
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doubleone44 wrote:
mrheosuper wrote:
2000 lumen highest with just only 4.7A, doubt it !!!

Why? The battery voltage under load should be about 3.8V, using a good battery, so this means about 3.8 V *4.7 A = 17.86 W input into driver, with the 90% efficiency of the H1A this means 0.9*17.86 W=16.074 W to the led, and cree lists 2654 lumen with the 18W max input, taking this into account, and 10% losses from reflector/lens, expected lumens are 2654 lm/18 W*16.074 W*0.9 = 2133.02 lm, so above the 2000 lm at startup.
(Correct me if my math is wrong)


Maybe you are right, im just amazed how far led technology has gone
The efficiency of LED now is really impressive

Forgot my pen

mrheosuper
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Btw
According to this test
http://budgetlightforum.com/node/53086
The led gives 2200 lumen at 18w
And your math said the led recieve 16W, so i guess the lumen is about 2000-2100 lumen
With 10% loss of glass and reflector, maybe the number is nearly below 2000 lumen
Still impressive

Forgot my pen

giorgoskok
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Thanks for your kind words and nice comments explaining some great things . I was away from home for a few days , so now i got the time to read the comments and update the review Wink

Beamshots coming in a few minutes , and conclusion maybe too .