LED Panel F-Series GEN 3 or Bridgelux EB Series Gen 2

nfhiggs

nfhiggs

Well-Known Member
haze010 said:
Late to the thread but on strip choice why does everyone forget about samsung H series? its just as viable as f series.

I did the 2 foot ones and if youre doing 25 or more the price isnt bad.
https://www.arrow.com/en/products/si-b8v11156hus/samsung-electronics
Under $9 a strip, when i did mine it was closer tho $8 though.
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Not as cost effective. $9 for 48 diodes, 22" strip (25 pc discount) versus $11 for 72 diodes 22" strip (25 pc discount). That works out to 18.75 cents per diode versus 15.27 cents per diode. F strips are the better deal.

overdriver said:
What does it need to keep a 4ft samsung f-series strip cool?
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Just good airflow if you stay at test current or lower.
 
ANC

ANC

Well-Known Member
Now that things are getting cooler my sinks are just luke warm,
They got pretty hot, approaching 50C when our temps went up to 110 degrees a few times.
The run isn't big enough this round to justify climate control.
 
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overdriver

Member
Sry I meant what does it need to keep the f-series cool at max current.
So 1.1 or 1.2 A.
Did anyone in this Forum ever measured the temperature of the f-strips with different current like in the bridgelux EB thermal thread?
 
ANC

ANC

Well-Known Member
I run mine hard, 3 strips to a 320W driver. The sinks are simple 74 x 18mm channel, maybe 2mm thick.

I run FB24Bs

I have one of those probes that are meant for the temperature dimple, I just don't know where it is now... actually forgot about it. Might go looking for it later. Know where I saw it last.
 

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overdriver

Member
ANC said:
I run mine hard, 3 strips to a 320W driver. The sinks are simple 74 x 18mm channel, maybe 2mm thick.

I run FB24Bs

I have one of those probes that are meant for the temperature dimple, I just don't know where it is now... actually forgot about it. Might go looking for it later. Know where I saw it last.
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would be very interesting to know how hot your strips get.
 
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slope

Member
I want to use aluminum flat bar as heat sinks for samsung f series. Would there be any difference between the efficiency of heat dissipation using a wide, shallow piece and a narrow, deep piece, assuming they have the same mass/volume and all other things being equal? I've no head for science so any help would be appreciated. My assumption is that the higher the surface area the quicker the heat dissipation. Is that correct?
 
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SSGrower

SSGrower

Well-Known Member
slope said:
I want to use aluminum flat bar as heat sinks for samsung f series. Would there be any difference between the efficiency of heat dissipation using a wide, shallow piece and a narrow, deep piece, assuming they have the same mass/volume and all other things being equal? I've no head for science so any help would be appreciated. My assumption is that the higher the surface area the quicker the heat dissipation. Is that correct?
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There will be a line to walk between rate of heat disipation and chip temperature. This is why heat sinks are thick bases with thin fins.

So the answer is yes form will matter in the science of things but I dont think it makse much difference in the performace of these strips unless you are planning on attaching them to a sheet of aluminum foil vs. 1/4 in flat stock.

Dicslaimer, I have not run strips like this, I'm just trying to explain the siecne behind it.
 
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slope

Member
Thanks for replies. Digikey customer service told me they didn't need heat sinks but I guess any help in dissipating the heat generated will improve their efficiency and lifespan. I'm planning on running them at 1.05 amps, a little below the test current, so that may help. Unfortunately, we seem to be behind the times with everything here and I haven't been able to source heat sinks proper for them (need about 600mm in length) without incurring very hefty shipping costs.
 
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nfhiggs

nfhiggs

Well-Known Member
slope said:
I want to use aluminum flat bar as heat sinks for samsung f series. Would there be any difference between the efficiency of heat dissipation using a wide, shallow piece and a narrow, deep piece, assuming they have the same mass/volume and all other things being equal? I've no head for science so any help would be appreciated. My assumption is that the higher the surface area the quicker the heat dissipation. Is that correct?
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Surface area is what counts. Use channel instead of flat stock, its much more effective.
 
nfhiggs

nfhiggs

Well-Known Member
slope said:
Thanks for replies. Digikey customer service told me they didn't need heat sinks but I guess any help in dissipating the heat generated will improve their efficiency and lifespan. I'm planning on running them at 1.05 amps, a little below the test current, so that may help. Unfortunately, we seem to be behind the times with everything here and I haven't been able to source heat sinks proper for them (need about 600mm in length) without incurring very hefty shipping costs.
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You can get a dozen .601 profile heatsinks 22" in length (560 mm) from HeatsinkUSA for under 50 bucks shipped (at least I did). Where are you located?
 
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slope

Member
ANC said:
They don't need heatsinks to stay within safe operating temperatures.
BUT, the cooler they are the more photons they put out for the same power input.
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Exactly - that's why I want to use something to dissipate the heat rather than not bothering at all, which, as you say, is an option. The hassle and cost of obtaining heat sinks proper (and LED Gardner) led me to the flat bar/channel alternative.
 
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slope

Member
nfhiggs said:
You can get a dozen .601 profile heatsinks 22" in length (560 mm) from HeatsinkUSA for under 50 bucks shipped (at least I did). Where are you located?
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Thanks for the heads-up but I already checked Heat-sink USA - the cost of shipping to me is just shy of $80. More than twice the cost of the heat sinks themselves. Without the shipping they'd only be slightly more expensive than buying flat-bar here.
 
nfhiggs

nfhiggs

Well-Known Member
slope said:
Thanks for the heads-up but I already checked Heat-sink USA - the cost of shipping to me is just shy of $80. More than twice the cost of the heat sinks themselves. Without the shipping they'd only be slightly more expensive than buying flat-bar here.
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If that's not an option then, I would definitely consider U-channel, instead of flat stock. Architectural U-channel is about the cheapest you will find. Here its about $10 for 8 foot lengths and most hardware stores carry it.
 
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