coreywebster
Well-Known Member
diyled from the uk. Are you an old face with a new name?
Advice please - 12v or 36v led drivers for diy cob build
- Thread starter Northernpop
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- cob diy
Northernpop
Well-Known Member
Hey diyled, do you think these heatsinks would be ok, if I opt for 4 x 50w cobs? They're only £8 each !
Humple
Well-Known Member
Are you thinking one of these heatsinks per COB? Haven't run COBs myself, but those look pretty damn beefy. And plenty of surface area to add some far red monos...
Randomblame
Well-Known Member
Should work! You can use 110cm²/1 heatwatt as rule of thumb.
An example, a 50% efficient 50w COB produce 25PAR/w and 25w heat.
25hw x 110cm² = 2750cm²,
so you need a heatsink with at least 2500cm² surface area.
But most COB's are more efficient at 50w and you have always a bit air movement inside your tent, also the rule is calculated with cool to touch heatsink temps in mind.
You can probably get away with only 2000cm² per 50w COB.
Northernpop
Well-Known Member
Too small for 50w passiv and far too expensive! Look for Intel 1154 coolers the ones with copper core(e3ay). You can get them in 10packs for very cheap(less than 50$/10pcs). But you will need a 5v/2A driver to drive the fans, I like the 3-12v wallplug drivers because you can use various voltages for different fan speeds.
As I'm avoiding fans at all cost, do you guys think this heatsink will cool one 50w cob led ?
Cheers !!
Randomblame
Well-Known Member
Not sure! The fins spacing is a bit too small for effective passive cooling.
BTW, something went wrong with your latest post because it looks like I've mentioned it.
You probably started writing above the second "[/quote]".
BTW, something went wrong with your latest post because it looks like I've mentioned it.
You probably started writing above the second "[/quote]".
Northernpop
Well-Known Member
Yeah, me bad. Sorry, didn't realise till posted. I'll keep looking.
Northernpop
Well-Known Member
I
Hi Diyled. I've gone around in circles trying to find reasonable heatsinks, but after reading up on the double F series, it looks like an excellent choice for me.
I'm more familiar with the standard cobs, cob holders, and heatsink setup, but are these as straight forward to wire as those?
Do you know any YouTube links to show me please?
Happy growing !!
diyled
Well-Known Member
Yeah its the same as a cob build. led/heatsink/driver. Wired in parallel
lots of info in here.
http://ledgardener.com/samsung-lm561c-build-finishing-touches/
lots of info in here.
http://ledgardener.com/samsung-lm561c-build-finishing-touches/
Northernpop
Well-Known Member
Sweet as a nut. Cheers pal. You're a legend.
Decent build on its way !!
Decent build on its way !!
Northernpop
Well-Known Member
Last question. Lol.
This seems a good buy at only £50 incl. del, but will it run the Samsung F-Series Gen3 strips (4 x 2 foot double strips)? It has an output of 1.4A.
Cheers.
Last edited:
Northernpop
Well-Known Member
Ok, this is the last question......
Are these correct? The spec looks great. I think the meanwell driver will work too. Could I even go for 5 strips?
Thanks.
Are these correct? The spec looks great. I think the meanwell driver will work too. Could I even go for 5 strips?
Thanks.
Northernpop
Well-Known Member
Many thanks again diyled.
I've looked through my posts to you, and it's fairly painful to read. Your patience is appreciated.
The ELG-240-48b drivers don't seem to be in stock, and TME couldn't find the HLG-240-48b. Is there an alternative, and i can place an order.
I'll post my diy strip build for others, when I start. There doesn't seem many available, compared to pin heatsinks and Cree/Citizen cobs, holders, etc.. That's what put me off initially.
Peace out.
I've looked through my posts to you, and it's fairly painful to read. Your patience is appreciated.
The ELG-240-48b drivers don't seem to be in stock, and TME couldn't find the HLG-240-48b. Is there an alternative, and i can place an order.
I'll post my diy strip build for others, when I start. There doesn't seem many available, compared to pin heatsinks and Cree/Citizen cobs, holders, etc.. That's what put me off initially.
Peace out.
Moflow
Well-Known Member
Here's a link for the meanwell HLG 240h 48b .....TME Site
https://www.tme.eu/en/details/hlg-240h-48b/led-power-supplies/mean-well/
skoomd
Well-Known Member
Dont forget arrow too. Orders over $50 ship to the US with free 1 day shipping, international orders ship free as well.
https://www.arrow.com/en/products/hlg-240h-48b/mean-well-enterprises
https://www.arrow.com/en/products/hlg-240h-48b/mean-well-enterprises
diyled
Well-Known Member
Avoid arrow if your in the uk. I once put an order in for 3 different drivers and they sent them all separate ,each with a £12 courier admin fee on.. I was expecting the 1 fee but to send my £36 admin fee on a £100 order was taking the piss.
No worries.The A type is still instock just has a inbuilt dimmer rather than a lead https://www.tme.eu/en/details/elg-240-48a/led-power-supplies/mean-well/
Or the 1 moflow posted has the dimming lead but are a bit more then the ELG version.
