Heatsinks for DIY LED lamps

[SupraSPL]

The scale is 20 pixels/inch. I think that arrangement is pretty close to ideal but I was just roughing the position of each COB to try and compromise cooling and spread. You could mount them with precision if you cared to run the math and make the measurements, but in practice it is not necessary.

 

[AllDayToker]

The scale is 20 pixels/inch. I think that arrangement is pretty close to ideal but I was just roughing the position of each COB to try and compromise cooling and spread. You could mount them with precision if you cared to run the math and make the measurements, but in practice it is not necessary.

Alright, so is there like a good cut off point with them? Like having them too far that there is a noticeable gap, or having them too close where I'm losing light from overlapping.

 

[SupraSPL]

Yes there will be an ideal distance. It would be hard to know what that distance will be because it depends on how the lenses are mounted and how they will interact with your LES. You will be able to see it though and I would estimate ~12-15"

 

[AllDayToker]

Yes there will be an ideal distance. It would be hard to know what that distance will be because it depends on how the lenses are mounted and how they will interact with your LES. You will be able to see it though and I would estimate ~12-15"

Any with the staggering it allows me to get a little further between each row correct? So if I spaced them perfectly apart across the 62" heatsink in two rows of four, staggering the rows, would that be my best option? So 15 1/2" between each, then stagger to cover that 15 1/2" gap better?

 

[SupraSPL]

I would start on the corners, to make sure they have a decent amount of base around them, ~2.25" from the edges. That leaves you with 57.5" remaining, divided by 7 gaps, the distance between the remaining 6 COBs is 8.2" and ~1.75" from the edge.

 

[AllDayToker]

I would start on the corners, to make sure they have a decent amount of base around them, ~2.25" from the edges. That leaves you with 57.5" remaining, divided by 7 gaps, the distance between the remaining 6 COBs is 8.2" and ~1.75" from the edge.

View attachment 3505680

That's perfect. Thanks a ton!

 

[brettsog]

Ok so I have bought my cobs (3 x vero29 3000k). Would I be better going with individual heatsinks ando fans (alpine 11 or 64 plus) or I can buy a 700x150x20mm heatsink which I would hope to cool them passively? Any thoughts? I will probably be running them at around 2.1a and 75w each

 

[alesh]

Ok so I have bought my cobs (3 x vero29 3000k). Would I be better going with individual heatsinks ando fans (alpine 11 or 64 plus) or I can buy a 700x150x20mm heatsink which I would hope to cool them passively? Any thoughts? I will probably be running them at around 2.1a and 75w each

I don't think that such a heatsink will be enough to cool them passively at 75W. More info would be helpful (preferably a link).

 

[brettsog]

I don't think that such a heatsink will be enough to cool them passively at 75W. More info would be helpful (preferably a link).

http://www.ebay.co.uk/itm/131535356625?var=430907052409

 

[littlejacob]

Bonjour
TME is cheaper for a 1000*165*35...42 € with vat
Have a great day ★

 

[brettsog]

Bonjour
TME is cheaper for a 1000*165*35...42 € with vat
Have a great day ★

Much better choice, so could I run 3 vero 29s with that heat sink say at 1.05a passively cooled?

Edit: I found these

http://www.digikey.co.uk/product-search/en?KeyWords=1061-1153-ND&WT.z_header=search_go

I don't even have to drill to attach a fan by the looks of it,

Edit 2: I found the fans to go with it as well. For an individual setup the fan is 13 and the heatsink 8.50. So 21.50 and it's made for the vero 29 and just realised it's the recommended cooling option for them on the bridgelux data sheet.

 

[littlejacob]

QUOTE="brettsog, post: 11928579, member: 423334"]Much better choice, so could I run 3 vero 29s with that heat sink say at 1.05a passively cooled?[/QUOTE]
Bonjour
There's the formula in heatsink for diy thread and in heatsink in europe thread...it is in inch that you change in cm...I hate math...try to ask someone there and translate in inch!
But I am sure that you would need only one fan if you need some...a 140mm @9V...less than 2w...
Have a great day ★

 

[AllDayToker]

This sucker is heavy!

First piece for the next light build.

 

[littlejacob]

[QUOTElDayToker, post: 11929193, member: 166764"]This sucker is heavy!

First piece for the next light build.

[/QUOTE]
......déjà vu.....

 

[AllDayToker]

[QUOTElDayToker, post: 11929193, member: 166764"]This sucker is heavy!

First piece for the next light build.

......déjà vu.....[/QUOTE]

Seen this picture before? Haha.

Just spreading my mad excitement for my second build.

 

[littlejacob]

Bonjour
I fully understand my friend...trust me on this!
CU

 

[AllDayToker]

Bonjour
I fully understand my friend...trust me on this!
CU

Hell yeah mane!!

 

[array]

What do you guys use to power the 4 pin heatsink fans? I was looking at those:
Coolerguys 100-240v AC to 12 & 5v DC 4pin Molex 2A Power Adapter https://www.amazon.com/dp/B000MGG6SC/ref=cm_sw_r_awd_WZEbwb52TZGT4

Phobya 8 x 4-Pin PWM Fan Splitter PCB (Power Eight Fans from One Power Board!) https://www.amazon.com/dp/B00OD7MO6E/ref=cm_sw_r_awd_ebFbwbKY3D948

Is there any better/cheaper solution?

 

[salmonetin]

...maybe... for 4 pin...

http://www.frozencpu.com/products/23517/ele-1301/4-Pin_PWM_Power_Distribution_PCB_8x_Way_Block_MMT-PCB-8P-44P.html?tl=g34c17s424

http://www.frozencpu.com/products/25650/ele-1333/Phobya_PWM_8x_4-Pin_Splitter_81136.html?tl=g34c17s424

http://www.frozencpu.com/products/6084/bus-107/AC_to_DC_Adapter_-_110V_AC_to_12V_5V_DC_Converter_w_Standard_4_Pin_2000mA_Max.html?tl=g47c271

http://www.frozencpu.com/products/9106/bus-192/AC_to_DC_Adapter_-_110V_AC_to_12V_DC_Converter_w_Standard_4_Pin_5000mA_Max.html?tl=g47c271s670

http://www.coolerguys.com/840556029977.html

...links are only for examples or ideas...



Saludos

 

[array]

Thanks