Heatsinks for DIY LED lamps

flaxseedoil1000

flaxseedoil1000

Well-Known Member
bassman999 said:
I believe heat watts are the result o the cob efficiency.
So 56% efficient leaves 44% gong to heat.
So .44 time 200 watts = 88 heat watts.
I am not sure if this is right, but thats how I understand it.
Click to expand...

I think in this instance 1.4 amps @ 50c = 52% efficiency and 49 dissipation watts
 
flaxseedoil1000

flaxseedoil1000

Well-Known Member
^ no worries :)



Anyone used the 10.08" with it's 2.5" fin height?

Wondering if when used passively the increased fin height could trap air. Same spacing as the 5.88 but much taller fins.

tia
 
yoda954

yoda954

Well-Known Member
hello all

I received 4 fan enermax twister pressure from a friend

http://www.enermax.co.uk/fans/twisterpressure/

what do you think

is what one will suffice for a heatsink 36" length X 5,886 wide
or do I put two

if you is it better to put one, but 140 Wide or a single 120 Wide

my setup will :
@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A
(1) HLG-185H-C1400
heatsink -> 5.886" X 36"
(4) lenses $16


thank's you so much
 
Maine_Coast

Maine_Coast

Well-Known Member
yoda954 said:
hello all

I received 4 fan enermax twister pressure from a friend

http://www.enermax.co.uk/fans/twisterpressure/

what do you think

is what one will suffice for a heatsink 36" length X 5,886 wide
or do I put two

if you is it better to put one, but 140 Wide or a single 120 Wide

my setup will :
@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A
(1) HLG-185H-C1400
heatsink -> 5.886" X 36"
(4) lenses $16


thank's you so much
Click to expand...
I have the same build, but I use 40" of the 5.886. I opted not to use a fan and the heatsink stays at 25C with a circulating fan and about 31 with the circulating fan off. With the circulating fan, the heatsink is cool to the touch and without it is just warm. I think you can get away with no fan. I thought about adding a fan before I started the build but when I tested it, I didn't really feel I needed to add it. I also did not uses the lenses.
 
Airwalker16

Airwalker16

Well-Known Member
Maine_Coast said:
I have the same build, but I use 40" of the 5.886. I opted not to use a fan and the heatsink stays at 25C with a circulating fan and about 31 with the circulating fan off. With the circulating fan, the heatsink is cool to the touch and without it is just warm. I think you can get away with no fan. I thought about adding a fan before I started the build but when I tested it, I didn't really feel I needed to add it. I also did not uses the lenses.
Click to expand...
hm. I wonder at this rate with my 3 on a 30" HS would be the same situation run passively
 
Airwalker16

Airwalker16

Well-Known Member
Found em haha
But from someone who has built a fee of these and mounted a cob a plenty, what's the appropriate length you suggest? M3: 3MM,4MM,5MM, or 6MM?
 
J

john0000

Well-Known Member
Maine_Coast said:
I have the same build, but I use 40" of the 5.886. I opted not to use a fan and the heatsink stays at 25C with a circulating fan and about 31 with the circulating fan off. With the circulating fan, the heatsink is cool to the touch and without it is just warm. I think you can get away with no fan. I thought about adding a fan before I started the build but when I tested it, I didn't really feel I needed to add it. I also did not uses the lenses.
Click to expand...
I'm with ya i did the same but went 42 '' hs ..what kinds spread you using between cob
 
Airwalker16

Airwalker16

Well-Known Member
Airwalker16

Airwalker16

Well-Known Member
kony brado said:
http://www.amazon.com/gp/product/B00GDZG5XW?psc=1&redirect=true&ref_=ox_sc_act_title_2&smid=ATVPDKIKX0DER

no. 43 drill
Click to expand...
http://www.ebay.com/itm/like/171938359896?ul_noapp=true&ul_ref=http%3A%2F%2Frover.ebay.com%2Frover%2F1%2F711-117182-37290-0%2F2%3Fmtid%3D1588%26kwid%3D1%26crlp%3D53601919689_324272%26itemid%3D171938359896%26targetid%3D154774698489%26rpc%3D0.07%26rpc_upld_id%3D62501%26device%3Dm%26mpre%3Dhttp%253A%252F%252Fwww.ebay.com%252Fulk%252Fitm%252Flike%252F171938359896%253Flpid%253D82%2526chn%253Dps%26adtype%3Dpla%26googleloc%3D9029829%26poi%3D9029794%26campaignid%3D239125209%26adgroupid%3D14978428809%26rlsatarget%3Dpla-154774698489%26gclid%3DCjwKEAiAw4e1BRDfi7vghaWU9jESJACzo9ju5HirKn9G9hMbuioDV9BS8dowoZkwrGHE6_xdfyKdSRoCXvHw_wcB%26srcrot%3D711-117182-37290-0%26rvr_id%3D970736099724&chn=ps&lpid=82
These are shorter M3 4mm long self tapping. You don't Wanna drill through the heat sink into the fins if you don't have to right?
 
PerroVerde

PerroVerde

Well-Known Member
Airwalker16 said:
https://www.google.com/search?q=self+tapping+m3+4mm+screws&noj=1&tbs=vw:l&tbm=shop&srpd=11231593939027824328&prds=num:1,of:1&ved=0ahUKEwjA46249r7KAhUI0mMKHRT7Cc8QgjYI4QMwAA&ei=huqiVsCIAYikjwOU9qf4DA

Those are a bit too long man. You don't wanna go through the heat sink if you don't have to.
Click to expand...
Why not? Aluminum is soft, the more threads the better. How dose going through the sink change anything? Just curious... :) I added to my post the same seller at Amazon has 8mm and 10mm lengths... :)
 
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