Don't buy Heat sinks from Hangzhou Langteng Machinery on Alibaba.

[DankaDank]

I have been working on a new project which involves 4 CLU048-1212's on one 180mm heatsink @ 700ma each with lens. I was going to buy heatsinks from Kingbrite but they did not have non-drilled heatsinks .


So I decided to buy from Hangzhou. I specifically told him I need 10 non-drilled heatsinks.
And the heatsinks are advertised as not drilled. You are supposed to request custom drilling if required.
This is what I received.





4 of the heatsinks are drilled with some crazy ass design. Still trying to figure out what the fuck these where drilled for. However since 2 of the 4 holes surrounding the center are exactly 43mm from hole center to hole center and there are 4 of them, maybe this is Gods way of saying build a Titan with the new Vero 29 SE.
The non-drilled ones are in good condition but the drilled look like they been shipped around the world 10 times. Even the boxes that the non-drilled ones are in are in way better nick.

Anyway I'm pretty pissed off since after initial cost, Bank transfer fees, shipping and ransom fees thanks to UK customs, they are worth just shy of £40 a piece.

Maybe I'll put them on Ebay and sell them for a loss, Any one in UK interested in 4 of these for a 100 quid.

 

[shadow_moose]

Fuck that, do a charge back on the heatsinks at least. You can dispute customs charges but it's a pain in the ass.

 

[Johnnycannaseed1]

Wow that is seriously taking the pee... But it is pretty much as moose said phone or go into your bank and tell them you want to do a debit claw back on the payment due to not receiving the items you purchased... which technically is true, because you asked for undrilled heatsinks and instead the seller ripped you off on part of the order... If you went through alibaba raise a dispute there as well, good luck and hope it pans out for you

 

[coreywebster]

Shit that's an expensive disappointment, sucks dicks getting heat sinks in the UK sometimes ey. Next time you buy from Alibaba tell them to mark them as samples and undervalue them to save a chunk on customs.. That 20% extra is a ball ache.

 

[qballizhere]

I have been working on a new project which involves 4 CLU048-1212's on one 180mm heatsink @ 700ma each with lens. I was going to buy heatsinks from Kingbrite but they did not have non-drilled heatsinks .
View attachment 3893424

So I decided to buy from Hangzhou. I specifically told him I need 10 non-drilled heatsinks.
And the heatsinks are advertised as not drilled. You are supposed to request custom drilling if required.
This is what I received.
View attachment 3893423

View attachment 3893427


4 of the heatsinks are drilled with some crazy ass design. Still trying to figure out what the fuck these where drilled for. However since 2 of the 4 holes surrounding the center are exactly 43mm from hole center to hole center and there are 4 of them, maybe this is Gods way of saying build a Titan with the new Vero 29 SE.
The non-drilled ones are in good condition but the drilled look like they been shipped around the world 10 times. Even the boxes that the non-drilled ones are in are in way better nick.

Anyway I'm pretty pissed off since after initial cost, Bank transfer fees, shipping and ransom fees thanks to UK customs, they are worth just shy of £40 a piece.

Maybe I'll put them on Ebay and sell them for a loss, Any one in UK interested in 4 of these for a 100 quid.

I cant say for the UK but in the US talk to the bank and start a dispute with the company.

 

[CobKits]

damn them some big ass pictures. makin my shit look like AOL 1995

 

[GrowUrOwnDank]

I have been working on a new project which involves 4 CLU048-1212's on one 180mm heatsink @ 700ma each with lens. I was going to buy heatsinks from Kingbrite but they did not have non-drilled heatsinks .
View attachment 3893424

So I decided to buy from Hangzhou. I specifically told him I need 10 non-drilled heatsinks.
And the heatsinks are advertised as not drilled. You are supposed to request custom drilling if required.
This is what I received.
View attachment 3893423

View attachment 3893427


4 of the heatsinks are drilled with some crazy ass design. Still trying to figure out what the fuck these where drilled for. However since 2 of the 4 holes surrounding the center are exactly 43mm from hole center to hole center and there are 4 of them, maybe this is Gods way of saying build a Titan with the new Vero 29 SE.
The non-drilled ones are in good condition but the drilled look like they been shipped around the world 10 times. Even the boxes that the non-drilled ones are in are in way better nick.

Anyway I'm pretty pissed off since after initial cost, Bank transfer fees, shipping and ransom fees thanks to UK customs, they are worth just shy of £40 a piece.

Maybe I'll put them on Ebay and sell them for a loss, Any one in UK interested in 4 of these for a 100 quid.

Have you considered calmly sitting down and writing the vendor? Perhaps the vendor is reasonable and will simply replace the drilled heatsinks?

 

[DankaDank]

Fuck that, do a charge back on the heatsinks at least. You can dispute customs charges but it's a pain in the ass.

Wow that is seriously taking the pee... But it is pretty much as moose said phone or go into your bank and tell them you want to do a debit claw back on the payment due to not receiving the items you purchased... which technically is true, because you asked for undrilled heatsinks and instead the seller ripped you off on part of the order... If you went through alibaba raise a dispute there as well, good luck and hope it pans out for you

I cant say for the UK but in the US talk to the bank and start a dispute with the company.

Thanks guys, i'll see what I can do.

Shit that's an expensive disappointment, sucks dicks getting heat sinks in the UK sometimes ey. Next time you buy from Alibaba tell them to mark them as samples and undervalue them to save a chunk on customs.. That 20% extra is a ball ache.

I'll defiantly do that next time. I forgot to ask for a mark down, this time. Costly mistake.

damn them some big ass pictures. makin my shit look like AOL 1995

I had no idea how big they are, it's weird cause they are taken with some shitty no name brand phone.

Have you considered calmly sitting down and writing the vendor? Perhaps the vendor is reasonable and will simply replace the drilled heatsinks?

I am still waiting for a response but perhaps its unfair to make this thread without waiting a few days for a response. I was just pissed off man not trying to be dramatic.

 

[GrowUrOwnDank]

Thanks guys, i'll see what I can do.


I'll defiantly do that next time. I forgot to ask for a mark down, this time. Costly mistake.


I had no idea how big they are, it's weird cause they are taken with some shitty no name brand phone.



I am still waiting for a response but perhaps its unfair to make this thread without waiting a few days for a response. I was just pissed off man not trying to be dramatic.

No worries bro. I ordered some COBs from China on eBay mid December and still waiting. lol. It's just a curiosity project and I only paid like $4.22 so. lol. eBay opened a case for me the other day as well. For what I paid if they come they come. If they don't eventually I will just leave a negative feedback but, I will be patient about it. I honestly don't see how this eBayer makes any money. 2 110v 50w COBs shipped from china for $4.22? Needless to say, my expectations are very very low anyway. If they even come. I feel bad for this seller so I may not even leave negative feedback lol.

Anyway, consider that someone somewhere may be waiting for their "custom drilled" heatsinks they ordered? Perhaps they were mistakenly shipped to someone who ordered undrilled heatsinks? lol. Good luck to you.

 

[thetr33man]

If you are using 1212s I guess I dont think you will have any issues using those, even if there are holes under them. Put a little extra thermal compound in the holes but because citi's dissipate heat so well, it shouldnt matter.

 

[GrowUrOwnDank]

If you are using 1212s I guess I dont think you will have any issues using those, even if there are holes under them. Put a little extra thermal compound in the holes but because citi's dissipate heat so well, it shouldnt matter.

We should run this by some science guys. Check this theory. What are the pins or fins on a heatsink designed to do? Increase the surface area of the aluminum to dissipate heat? Correct? Think "surface area for air to flow".

The chip and the heatsink along with "thermal" material are designed to effectively transfer the heat from the chip to the solid material to the pins which will dissipate the heat. The thermal material "fills in the gaps" between the chip and the heat sink.

Holes? Well obviously, you don't want holes underneath the chip, except maybe in the outer corners to secure the chip. Without any gaps between the chip and the heatsink which is to absorb and distribute the generated heat.

But, wouldn't holes outside of where the COB is secured increase surface area? I mean you have all that exposed area for air to flow through and help dissipate heat. Right?

I'm actually stoned. But. It makes perfect sense that holes in other areas of the heatsink would increase exposed surface area. As long as it isn't below the chip which will inhibit heat transfer.

Don't plug the holes if you decide to jus use them. In my opinion.

 

[CobKits]

not much air flowing thru holes. id say they are negligible unless they are under the LES

 

[Johnnycannaseed1]

We should run this by some science guys. Check this theory. What are the pins or fins on a heatsink designed to do? Increase the surface area of the aluminum to dissipate heat? Correct? Think "surface area for air to flow".

The chip and the heatsink along with "thermal" material are designed to effectively transfer the heat from the chip to the solid material to the pins which will dissipate the heat. The thermal material "fills in the gaps" between the chip and the heat sink.

Holes? Well obviously, you don't want holes underneath the chip, except maybe in the outer corners to secure the chip. Without any gaps between the chip and the heatsink which is to absorb and distribute the generated heat.

But, wouldn't holes outside of where the COB is secured increase surface area? I mean you have all that exposed area for air to flow through and help dissipate heat. Right?

I'm actually stoned. But. It makes perfect sense that holes in other areas of the heatsink would increase exposed surface area. As long as it isn't below the chip which will inhibit heat transfer.

Don't plug the holes if you decide to jus use them. In my opinion.

You raise a good point because it does increase surface area, but you need to consider how deep those holes are, plus the resistance through the aluminium in order for the heat to radiate through the metal and be exchanged with the ambient air. Personally I am with COBKits on this one and think the effects at that hole size would be negligible, but your theory sounds good and possibly drilling blocks of ali right through with large holes might increase performance and create a chimney effect with regards to heat dissipation, so I like where you are going with your initial thoughts

 

[Mellodrama]

Thermal transfer will be compromised wherever there are holes behind the COB instead of metal. Packing extra thermal paste into the holes won't make a bit of difference.

Unless you're running these COBs at the ragged edge, I'd be inclined to think that a couple of holes wouldn't be the end of the world.

Having said that, I don't think I'd be able to talk myself into using them. It'd grate at me every time I thought about it.

You mentioned maybe going in a different direction because of the holes - something about a Titan with Vero 29's? If you had something else in mind that you think would be better, don't build something you didn't intend to build just because the vendor sent you the wrong items.

 

[GrowUrOwnDank]

not much air flowing thru holes. id say they are negligible unless they are under the LES

Yeah negligible. Still. Don't cause drama either science guy?

Convection. Heat rises.

 

[DesertHydro]

whats the deal with mounting multiple chips on one heatsink? if i did 2 1212's side by side, one in 6500 and one in 3000 but only fired one side at a time and then i would have veg and bloom in one array with a simple flip of a switch. any thoughts on this?

 

[GrowUrOwnDank]

I love stoners man. They're always coming up with some off the wall complicated shit when their high.

I love all y'all!

Peace and love always!

And bunnies.

 

[DankaDank]

whats the deal with mounting multiple chips on one heatsink? if i did 2 1212's side by side, one in 6500 and one in 3000 but only fired one side at a time and then i would have veg and bloom in one array with a simple flip of a switch. any thoughts on this?

I was actually considering having 4 x 1212's ( 2x 4000k and 2x 3000k) run in parallel series strings,
with the 3000k string having a switch. So the 2x 3000k are run in a series string and the 2x 4000k are run in a series string, then the two series strings are run in parallel @ 1400ma .
So now when you switch off the 3000k string,
the 4000k string is run 1400ma (100watts) for veg. When you switch the 3000k string on, all four cobs are run a 700ma each (100watts) for flower.

 

[DesertHydro]

I was actually considering having 4 x 1212's ( 2x 4000k and 2x 3000k) run in parallel series strings,
with the 3000k string having a switch. So the 2x 3000k are run in a series string and the 2x 4000k are run in a series string, then the two series strings are run in parallel @ 1400ma .
So now when you switch off the 3000k string,
the 4000k string is run 1400ma (100watts) for veg. When you switch the 3000k string on, all four cobs are run a 700ma each (100watts) for flower.

Nice. It seems like your heatsinks are definitely big enough to handle 100w