How hard have the eBay 100 watt LED COB's been pushed?

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Safe Gardener

Active member

• Jan 6, 2017

• #1

Hello ICMAG,

With much help from Dion, killkingkong and reading as many led/cob posts I could find I have finally put together a proof of concept and my first prototype.

Pics to follow.

In time I plan to build a higher end pannel bit for now it's eBay stuff. From reading I realize efficiency is much better with the cree and Vero lines, but I'm trying to find out how hard people have pushed the cheap eBay 100 watt chips that I am currently working with.

 

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S

Safe Gardener

Active member

• Jan 6, 2017

• #2

The two on CPU coolers are a cooler/daytime white (I think 6500k) but am not sure and the six on the 12" x 5.5" heatsink are warm white 3000k (or 2700k whichever is the cheap eBay version) I think.

 

S

Safe Gardener

Active member

• Jan 6, 2017

• #3

I have 4 x 30 watt eBay led drivers and a MEAN WELL CLG-150-48A drivers available.

If computer fans are necessary for cooling (which I think they will, but have IR gun to make sure) it's not an issue.

Initial plans are for the two daytime chips to be run at 15 watts each from one 30 watt driver and 2 x the 6 warm chip pannel to be run off the meanwell driver.

Does anyone think that one of the 6 chip pannels can handle that mean well driver? That's 150 watts running 6 eBay 100 watt COB chips @ 25 watts each.

 

S

Safe Gardener

Active member

• Jan 6, 2017

• #4

Pics

Pics

Pics of the drivers I already have.

I am open to any and all suggestions and am well
aware that my soldering can use some work.

Thanks for any and all suggestions.

 

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frica

Member

• Jan 6, 2017

• #5

But those ebay LEDs are often not even cheap...

 

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OTurmoil

New member

• Jan 7, 2017

• #6

These look to be the ones sold at around $2.60 a LED on ebay.

 

S

Safe Gardener

Active member

• Jan 8, 2017

• #7

OTurmoil said:

These look to be the ones sold at around $2.60 a LED on ebay.

Click to expand...

Yes, they are the least expensive 100 watt COB LED's I could find on eBay.

Running the 6 chip pannel for 45 min @30 watts I saw 67-70°F on the backside of where each chip is mounted. Next test will be running the pannel @60 watts and monitoring temps. Updates to follow.

 

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StevenJennings

Member

• Nov 16, 2017

• #8

I ordered a hontiey? I believe it is hontiey? Lol. 100 watt 6500k cob fpr shits and gigs for 6buck maybe and i only powered it at 1500 ma and i come home to a flicker of light and find tht the cob got so hot it straight melted the paste and fell off. Same paste i always use on a pretty nice chunk of aluminum (blown out car amp) but i guess i drove it too hard. Strange. I power veros and cxbs higher and had no problems. Idk man. I cant say alot because mine blew up. Im all for saving a buck but after the time and frustration i think i wouldve rather not even tried.

 

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Safe Gardener

Active member

• Jan 20, 2018

• #9

So you ran a 6 dollar cob at 1500ma and were surprised when it didn't work as well as a Vero or Cree?

This thread was started with the idea of under driving ebay/cheap (knock off COB's) not attempting to run them at the same power as their high end counter parts.

Using thermal paste is always a good idea, but you should also fasten the chip down with a couple screws too.

 

C

Chompie

Member

• Jan 22, 2018

• #10

You're honestly much much better off under-driving these and wiring them in parallel with each other. I've been using 5 of the 100w chips per 60w driver and they're still going strong 2 years later.

 

S

Safe Gardener

Active member

• Jan 22, 2018

• #11

That's similar to the setup I decided on. I have 3 100w chips per 30w driver. I don't have much run time on them but can say temps stay very reasonable.