KD (kaidomain): Deals and new products thread

[zeremefico]

Modded or stock?

[delete]

@zeremefico

Modded or stock?

stock.
I’ve just been using it for a few 10 or 15 minutes.

[EasyB]

@delete

my c8.2 xhp50.2 led 2die has dead

!!

I’ve seen several reports of this happening. Most of them have been using a FET driver so high current, but well below the max current that djozz tested. I wonder if the attachment of these flip-chip dies to the underlying substrate is not robust and can be disrupted by shock or thermal cycling.

[giorgoskok]

I have a C8.2 here that i’m reviewing , it still runs great after 5 full runs on max setting (5* 45 mins) , without a fan etc .

[khas]

@delete

my c8.2 xhp50.2 led 2die has dead

!!

I had the same thing happen to one of my XHP50.2, but I also have two still working fine : one in a Thorfire C8s with a H1-A driver and a Jaxman M2 with a LD-3 driver driven @ 6A.

[JIGHEADWORM]

@giorgoskok

I have a C8.2 here that i’m reviewing , it still runs great after 5 full runs on max setting (5* 45 mins) , without a fan etc .

Been looking at this light thinking about getting one.Would appreciate your opinion on it.

[BanL]

@delete

@zeremefico

Modded or stock?

stock.
I’ve just been using it for a few 10 or 15 minutes.

Hi delete

Please let me know more about the flashlight problem.

All the flashlights before we shipped out has been done a full battery testing.

I would like to see what is the matter and see how to improve it.

Thank you

Ban

[EasyB]

@Ollie

giorgoskok,

The fan would only work if the heat is getting to the outside surface of the light. I’m not being a wise guy. I just tried an experiment. Now, these lights aren’t driven very hard. However, I got to wondering if I could improve heat transfer. First up was putting a small amount of computer cpu “grease” on the threads, letting some slop over onto the ledge that the lip of the pill screws down against. Then I put the reflector into the head, to see how much space there was. Quite a bit, as it turns out. So I put three of those gray putty-looking heat transfer blobs on the inside if the head, put the reflector in, and screwed the bezel down tight. And we have a winner! After reassembly, I was comparing the beam pattern of an XM-L C8 to the C8.2. What I noticed was that the C8.2 was getting warm faster than before. I don’t have the means to measure how much warmer, but it does happen quicker.

This makes sense if you think about it. I asked Texas_Ace a question some time ago about heat. He said that 70% of the heat transfer was from LED to MCPCB and then to the body of the light. That means that the other 30% is going out the front. Shine the light on your hand, and you can feel it. To get there, the light has to hit the reflector, and in a C8, the reflector is aluminum. If we can transfer that heat from the reflector to the head of the light, this would be beneficial. Otherwise except for a couple of places, the reflector is just sitting in a good insulator, air.

I would hope that someone with a IR gun would quantify this. The effect may even be minimal, but it’s easy and cheap to do. I’d like to do this with the 70.2/Mag build, if I ever get to it. I suspect the benefit might be less, in that format.

Ollie

Roughly 30% of the input power leaves as light, but this doesn’t mean the reflector is heated significantly. The reflector might absorb 10% of the light, so all together maybe 3% of the power is heating the reflector.

[giorgoskok]

The pill has a very good fit , i don’t think this is the problem…

[bibihang]

@BanL

All the flashlights before we shipped out has been done a full battery testing.

Seriously? For every flashlight before shipping it out you need to run it on high mode for about 40 mins?

[BanL]

@bibihang

@BanL

All the flashlights before we shipped out has been done a full battery testing.

Seriously? For every flashlight before shipping it out you need to run it on high mode for about 40 mins?

Hi

Yes, for the KDLITKER flashlight, it will turn on the Hi-mode and run for at least 30 mins until the low voltage warning appear (Light is flashing).

Thank you

Ban

[Virisenox]

@pilotdog68

I’d buy from KD way more if their search function worked correctly. Maybe this thread will help.

It’s awful. You have to enter text the exact way it appears in the product title in order to get anything to show up.

[BanL]

@Virisenox\_

@pilotdog68

I’d buy from KD way more if their search function worked correctly. Maybe this thread will help.

It’s awful. You have to enter text the exact way it appears in the product title in order to get anything to show up.

Thank for your advice.

We will keep improving on our system.

If you get any error or not functioning well, please let me know.

Thank you

Ban

[hank]

KD (kaidomain): Deals and new products thread - #659 by BanL

That’s impressive testing. Good to know.

[LightRider]

@Ollie

George,

The pill has a good fit, the computer grease was just because I had it apart. But the fit of the reflector to the head is very loose. Take a bare head and a bare reflector; slide the reflector into the head, and look at the fit from the back. The only place the reflector touches the head is at the very front, at the lens. Room for improvement. The pill is pretty thin, too. I’ve “potted” them with lead-free solder. That’s probably unnecessary for the 3 Amp builds I do on a C8.

Ollie

This is not uncommon actually. Most lights work this way and many only touch the lens at the end and the led centering disc at the mcpcb

[BanL]

Hi friends

2 new CREE XP-L HD in stock

Cree XP-L HD W2 1B White 6000K - 6500K LED Emitter

Cree XP-L HD W2 2B White 5700K - 6200K LED Emitter

Thank you

Ban

[giorgoskok]

Ordered ! thanks Ban !

[BanL]

@giorgoskok

Ordered ! thanks Ban !

Ha

Thank you for your ordering.

[bwl123]

Hi BanL

Will it be possible to make this driver with a 17mm board?
http://www.kaidomain.com/p/S026606.H1-A-20mm-3A-1-cell-5-Mode-Boost-Driver-Circuit-Board-for-Cree-XHP50-6V-MT-G2-MK-R2

[glide_1]

Im trying to get more info on this driver - http://www.kaidomain.com/p/S024906.FX7-17mm-2_8V-4_8V-3A-5-Mode-LED-Driver-Circuit-Board-(1-pc)

Hoping someone has used this driver and would be able to give us first hand information.

Current: Max. 3A

Lo : 300mA @ 4.6V
Med : 1200mA @ 4.6V
Hi : 2900mA @ 4.6V

- Interesting why amp rating is measured at 4.6V.

• Is it possible to do a resistor mod?