Heatsinks for DIY LED lamps
- Thread starter SupraSPL
- Start date
BobCajun
Well-Known Member
You just buy empty floodlight bodies and put your cobs in them. They're like $7 each. Or you could just buy the complete floodlights for that matter. Some places have reasonable prices, like here. They have 400w ones now. Those units even have lenses on the cobs, unlike most floodlights, and a 60 degree reflector instead of the standard 120. You can even get warm white. Don't know what brand cobs they use though.
tenthirty
Well-Known Member
Just ordered one wil let you know.
Greengenes707
Well-Known Member
At 1000ma(~38w dissipated@~49% efficient) those M1's, the Tc won't stay below 70c with a cxa3070. Won't fit a 3590. So top efficiency choices are limited.
littlejacob
Well-Known Member
Bonjour
Where do you find the case for 7 $
The 2 cob one look good for 7 $
Have a great day ★
BobCajun
Well-Known Member
I just searched on Alibaba. All I found was one place that sold single cob fixtures. I don't know where all the floodlight companies get their fixtures from. Must be somebody making them. I doubt they all make their own. They do seem to be a good way to mount your cobs though, since they provide the heatsink and the reflector in a nice package.
qwerkus
Well-Known Member
I'm currently finalizing a deal with a chinese company for a similar setup. Though I'm going for track lights: similar price, and the heatsinks are optimized for indoor cooling. More on this when the lamps arrive.
BobCajun
Well-Known Member
A person could make a lot of money by buying a bunch of the floodlight bodies and a bunch of cobs and assembling them. Have you seen the prices for retail LED floodlights? How much would it cost for a body and two 100w cobs? Less than $100. If you look in places like Home Depot they don't even carry high wattage floodlights and the highest ones they do carry are usually sold out. I see big opportunity in LED floodlights. Where I live there is nowhere that I can just walk into and buy high wattage LED floodlights or high bays. I've never had so much trouble finding such a seemingly common item. I would have literally no competition anywhere near where I live. Importing stuff from China is a pain in the ass though isn't it? I never tried.
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littlejacob
Well-Known Member
Bonjour
Why shipping cost are a problem for you?
You are not in US?
If you are in EU try tme.com!
Have a great day ★
SupraSPL
Well-Known Member
@BobCajun I would suspect that they skimped on heatsinks and likely inadequate for cooling something like a grow lamp that runs long hours. Aluminum is a relatively high cost component for a lamp designed to minimize up front cost. That said I have not tested one and would love to have that assumption proven wrong. Do you have any links that show the heatsinks or give measurements/weights etc?
Another possibility, the heatsink may be steel rather than aluminum and that would be a raw deal for sure. Easy to check with a magnet
Another possibility, the heatsink may be steel rather than aluminum and that would be a raw deal for sure. Easy to check with a magnet
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littlejacob
Well-Known Member
speedyganga
Well-Known Member
Hi guys,
Just wondering, have you ever try to cool with less than 30cm/W in active dissipation?
I am right now at 90cm/W in passive but using the fan for plant to cool the lamp. I have a piece of heatsink laying around and it should be abe to cool 120W at 30cm/W do you think a 20cm/W active cooling is possible if I wanted to put 180W for example ? -> led efficiency about 35%
Just wondering, have you ever try to cool with less than 30cm/W in active dissipation?
I am right now at 90cm/W in passive but using the fan for plant to cool the lamp. I have a piece of heatsink laying around and it should be abe to cool 120W at 30cm/W do you think a 20cm/W active cooling is possible if I wanted to put 180W for example ? -> led efficiency about 35%
speedyganga
Well-Known Member
Well right now I am about to try cooling 200W of vero 13, 80mm fan, and about 20cm/W cooling.
BM9AGS
Well-Known Member
I'm working on getting GOGREENLEDS style cases. Just empty case. Once it's done we can order them directly from China. Then build our own lights with out paying the 70% markup of most companies. If it goes through there's gonna be some butt hurt
Banana444
Well-Known Member
http://www.heatsinkusa.com/8-000-new-now-available/
Sorry if this was already posted but they have a fairly new profile. It has a little thicker base and 1.0 fins and more of them. I am looking at either this profile or the 4.6 serrated fin (which i used on a 2x 5000k 3590 77v @1050ma) w active cooling. I am trying to decide on heatsinks for my next 4x 3590 4000k @1050ma and then either a 3500k or 3000k lamp (already ordered 2 hlg120hc1050). I guess whithout a direct comparison test you might not be able to speculate, but just based on a thicker base and more fins but shorter, which do you think is a better heatsink for 3590s @1050ma w active cooling?
Sorry if this was already posted but they have a fairly new profile. It has a little thicker base and 1.0 fins and more of them. I am looking at either this profile or the 4.6 serrated fin (which i used on a 2x 5000k 3590 77v @1050ma) w active cooling. I am trying to decide on heatsinks for my next 4x 3590 4000k @1050ma and then either a 3500k or 3000k lamp (already ordered 2 hlg120hc1050). I guess whithout a direct comparison test you might not be able to speculate, but just based on a thicker base and more fins but shorter, which do you think is a better heatsink for 3590s @1050ma w active cooling?