Budget 5700k CRI 95 100w COB for $11.25/pcs [Items in Stock]

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rngwn
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Budget 5700k CRI 95 100w COB for $11.25/pcs [Items in Stock]

Hi all,

I have found some supplier in Alibaba who can make 95 CRI COB for cheap and I would like to use this as my first-time selling experience. The appearance of the COB are shown below.

The brief specs are the following:

Voltage: 30-33V (starts to light at ~24-25V)

Wattage: 100w (can survive up to 120w of continuous power)

CCT: 5700k <5-step MacAdam (3500k is available if there are enough people ordering)

CRI: “98+” (Manufacturer rated, actually ~95 as tested by Maukka) This LED appears to have best color rendering when running at maximum current, so keep that in mind if you plan to under-drive this.

Construction: Flip-chip (no bond wires), Silicone-based phosphors fill.

Efficacy (at full power): 80-90 lm/w

Dimension:* 40×46 mm (can use the same tapping holes as the generic 100w chinese LED. However, some reflectors might not fit these perfectly)

I have ordered samples and sent some to Maukka for testing. Here is the CRI result for 5700k CCT:

CRI test at 30w:

CRI test at 100w:

Here is the Spectral Power Distribution given by the Manufacturer:

I think this could be a much cheaper alternative to Yuji’s 100w 5600k COBs. I would like to ask if some of you are interested in these COBs.

I will order these if the total amount interested is 25 pcs or more. I expect to keep this open for signing up for a month or two.

Here is how I plan to sell these.

Unit Price:

$11.25/pcs
—————————————————————————

Shipping and Packaging Fees

Priority: Thailand Post Int’l Registered Air Mail/Small Packet: (7-20 days)

To Southeast Asia countries: $4.5

To other countries: $6.0

Economy: Thailand Post Int’l Registered SAL Mail/Small Packet (3-7 weeks)

Non-ASEAN countries: $5.0 ($2.25 for non-registered, untracked)

FREE Priority shipping eligible for the order of 5pcs or more.

Note: I will declare the shipment the exact value as ordered. You are responsible for import taxes.

—————————————————————————

Payment via PayPal (the payment address will be sent via PM, buyers will be paying the fees). You can start paying after I made the purchase with the supplier. I will ship the item after you pay the item and shipping cost.

If you are interested and want to sign up, you can reply the amount you want below and PM me your name, shipping address, and telephone number. I can accept up to about 100 pcs of total order at this time.

Order have been placed, anyone interested can PM the shipping address now.

Amount available for sale:

5700k: 57 pcs
3500k: 17 pcs

—Update: Apr 20, 2019: Item has reached my country and I should be able to pick it up within next week.—
—Update: Apr 22, 2019: The goods is now with me, anyone interested please PM me the address.—

Edited by: rngwn on 06/10/2019 - 08:03
maukka
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More measurements in the imgur album here:
https://imgur.com/a/AZo1vf1

The 5700K one is my favorite out of the three I tested. Put some current through it and the tint is quite alright (not far from D55). The 3500K was a disappointment though.

BlueSwordM
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If more Canadians are interested, I can get more so shipping will be less expensive for us overall.

Edit: Will only be ordering if other Canadians want it.

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djozz
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I’m attracted to COBs but have no use for them. They are perhaps great for lighting projects in the house (of which I have none).

Good luck with the sales, I think it is a nice initiative.

prototype3a
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Why would I buy this instead of a Bridgelux Vero29? The circular shape of the Vero 29 seems like a huge advantage.

adam7027
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For indoor lighting, I think, the 3500K variant could be a very good match for my needs. Thank you maukka for showing your results Smile

I cannot say for sure yet, but maybe I would need 3 of them.

rngwn
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The good thing about LEDs of this shape is that they use the same mounting holes as these types of floodlights (which is pretty much the only moddable types sold where I live):

If you are looking to retrofit one of these for higher CRI or something similar, I thought these LEDs are worth considering.

LumenHound
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I wonder how much the output drops after being driven at 100 watts for 500 hours under the usual heat sinking an outdoor floodlight housing normally offers?

rngwn
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LumenHound wrote:
I wonder how much the output drops after being driven at 100 watts for 500 hours under the usual heat sinking an outdoor floodlight housing normally offers?

I wonder about that too. I think it can’t get any worse than the stock LED that originally comes with the flood light.

On a side note, I have retrofitted a 20w (in a 20w casing) and have it sit on my desk running 8-16 hours a day in a tropical climate for 9 months now. The light hasn’t seem to fade much from when it was first run.

HONDARIDER
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I might be interested in 2. I wouldn’t mind a round one of a similar size.

rngwn
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Let’s count the number of people interested so far:

Here is the interest/order status:

5700k:

HONDARIDER: 2pcs
BlueswordM: (Seeing if other Canadians want it)
Tc418: 3pcs [PAID & Shipped]
XXX-Man: 1pcs

3500k:
HONDARIDER: 1pcs [awaiting payment]
adam7027: 3pcs [PAID & Shipped]

DominikM
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Did seller provide you with the continuous (i.e. every 30 minutes) data for the first 100 hours of those led’s ? What kind of bond wire they are using ? The fill is silicone or epoxy based ?

It’s telling the guy who has ben buying in China 250k bulb’s and flood lamps per month… ;). The big COB are the easiest for small batch production, but the trickiest for long time usage.

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rngwn
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DominikM wrote:
Did seller provide you with the continuous (i.e. every 30 minutes) data for the first 100 hours of those led’s ? What kind of bond wire they are using ? The fill is silicone or epoxy based ?

It’s telling the guy who has ben buying in China 250k bulb’s and flood lamps per month… ;). The big COB are the easiest for small batch production, but the trickiest for long time usage.

I have reached out to the manufacturer yesterday.

The LED I will be selling is Flip-Chip type. There will be no bond wires inside these LEDs. The filler is silicone based, as usual.

They are currently doing the light decay test for me. The result should be available in a few days.

BlueSwordM
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Huh, that means better durability.

Nice.

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Tc418
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Put me Down for 3.

optosolis
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nice, would place it in something like this if It could work. if the LED could have an Enclosure;

https://www.instagram.com/p/BiHqBMggxzT/

Okluma DC2 Ti, Virence AT Wizard Pro E21A Quadtrix 6500/5000k Mixed 9080, Jetusolis 6500k 9080, JetE21A 4000k 9080, JetE21A ‘Red’ HCRI Led.

rngwn
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The LED uses the same mounting holes as this one.

However, the reflector and lens like this one can be a little tricky to install, since my LED won’t have any holes (like the generic 100w ones) matching the prongs of these reflectors.

rngwn
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Here is the reliability test data from the Manufacturer. They tested on their 80 CRI version though, but the difference should not be significant.

XXX-Man
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I would be interested in 1 5700k

"With the first link, the chain is forged. The first speech censured...the first thought forbidden...the first freedom denied – chains us all, irrevocably."

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rngwn
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Interest list and shipping cost updated.

rngwn
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bump

rngwn
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bump

rngwn
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I have reached out to one of the local shops and they are interested in 40pcs (5700k). Therefore, I decided to continue with the ordering.

I ordered:

100pcs 5700k 20pcs 3500k

If there are no upsets, the goods are expected to arrive by the end of this month.

Anyone who are interested can PM me of your shipping address now. I will ask you to pay when the goods are about to arrive at my location.

rngwn
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Update: The item is now (according to the shipping agent) at my country’s warehouse and I should be able to pick it up within this week with me, you can now start ordering.

rngwn
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Updated Stock:

5700k: 57/60 pcs
3500k: 20/20 pcs

rngwn
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Update:

Economy shipping (Registered, SAL) now available for non-ASEAN countries for $5.25. This shipping methods takes 3-7 weeks on average to arrive (not including customs clearance).

“Bare-Fare” Shipping (SAL, non-registered, untracked) is also available (3-7 weeks not counting customs clearance) at your own risk for $2.5.

If you wish your item to be shipped by one of these two methods, please tell me in the PM. Otherwise, I will assume the shipping method “Priority” by default.

rngwn
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Updated Stock:

5700k: 57/60 pcs
3500k: 17/20 pcs

rngwn
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bump

rngwn
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bump

Joshk
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I’m tempted, but what do I need to buy to power that?

rngwn
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Depends on how you want to power this. If you want to just power it off the mains, you just look around for the “100w led driver”. There are plenty of them over the Amazon/eBay/Aliexpress. Here’s the example (this isn’t the best quality available, but you could also search around). You might also want to pay attention to the efficiency and power factor of the drivers if electricity bill is a concern.

Chanzon’s LED driver – Amazon

On the other hand, if you want to go with a more DIY-ish route, or you want to power this off a battery, You could also buy a Buck/Boost converter (preferably with Constant Current feature) and hook it up to the Battery/DC power source. DIY perks made a video on how to wire it up. (It’s a different COBs but it’s functionally the same as this one).

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