Cheapest Cobs available in Europe

[KaraIsKing]

I want to know what are the best and cheapest led cobs in Europa and can I reuse my old water cooling system from my old pc?

 

[JimmyJames905]

I want to know what are the best and cheapest led cobs in Europa and can I reuse my old water cooling system from my old pc?

Digikey Europe
You're looking for the Bridgelux Vero 29 part number
BXRC-40E10K0-D-73-SE
Solderless connectivity built in. Highest par rating in its class (3200+ μmols...that's twice as bright as the summer sun).
You can drive 4 COBs on a single Meanwell HLG-240h-c1750b at 65w each or 4 COBs on a HLG-185h-c1400b at 50w each for a little less €€€. The Meanwell driver's are available through Mouser Europe.
Here's a video I did.
PAR testing COB's- Vero 29 SE D-Series (4000k) - YouTube

 

[KaraIsKing]

thanks, what k should i take for autoflowering since they mostly will be 20/4 on light

 

[JimmyJames905]

The chip I tested is the 4000k. It gives you near equal parts red and blue spectrum. It's the perfect "all in one" chip.
If you want deeper reds go with a few 1750k.

 

[KaraIsKing]

can i go like one 6500k , 2x 4000k and one 1750-2000k? the place it shall light is like 60x60x100cm

Tridonic - LED compact is any of them good? and i want to add some uva&b to it too

 

[JimmyJames905]

6500k is useless. They don't make a 2000k. Just 4000k and 1750k. My testing has shown that mixing 6500k, 5000k, 4000k and 3000k only results in the plants under the 5000k being short and dense while the lower Kelvin chips (3000k) end up being stretched considerably. The best solution is to but the 4000k on one set of drivers and the 1750k on another set of driver's. Use the 1750k 20 minutes before lights come on and 20 minutes after lights go off. This will give you a sunrise/sunset simulation. The 6500k through 3000k all contain the exact frequency of red, 630nm (just in different amounts). So adding multiple kelvin chips won't give you any other frequency. The 1750k chip however peaks at the 650nm and tapers off into infra red. There is no other cob on the market that does this. This chip is insanely red!!! It's marketed as a HPS replacement in a COB format.
Here's the video on the 1750k Vero 18. Vero 29's little brother.
PAR Testing the BXRC-17E Vero 18. Tent test. - YouTube

 

[JimmyJames905]

can i go like one 6500k , 2x 4000k and one 1750-2000k? the place it shall light is like 60x60x100cm

Tridonic - LED compact is any of them good? and i want to add some uva&b to it too

60x60 is very small. That's only 2 feet by 2 feet. You'll only need 2 COBs to fill this area. I'd recommend using the Vero 18 chips. Heatsinks, chips and driver's are all cheaper in the Vero 18 platform.

 

[Alex77145]

Hey, can you also link a heatsink I can use for this led? Preferably from one of the websites you listed.

 

[Alex77145]

6500k is useless. They don't make a 2000k. Just 4000k and 1750k. My testing has shown that mixing 6500k, 5000k, 4000k and 3000k only results in the plants under the 5000k being short and dense while the lower Kelvin chips (3000k) end up being stretched considerably. The best solution is to but the 4000k on one set of drivers and the 1750k on another set of driver's. Use the 1750k 20 minutes before lights come on and 20 minutes after lights go off. This will give you a sunrise/sunset simulation. The 6500k through 3000k all contain the exact frequency of red, 630nm (just in different amounts). So adding multiple kelvin chips won't give you any other frequency. The 1750k chip however peaks at the 650nm and tapers off into infra red. There is no other cob on the market that does this. This chip is insanely red!!! It's marketed as a HPS replacement in a COB format.
Here's the video on the 1750k Vero 18. Vero 29's little brother.
PAR Testing the BXRC-17E Vero 18. Tent test. -

 

[Alex77145]

Digikey Europe
You're looking for the Bridgelux Vero 29 part number
BXRC-40E10K0-D-73-SE
Solderless connectivity built in. Highest par rating in its class (3200+ μmols...that's twice as bright as the summer sun).
You can drive 4 COBs on a single Meanwell HLG-240h-c1750b at 65w each or 4 COBs on a HLG-185h-c1400b at 50w each for a little less €€€. The Meanwell driver's are available through Mouser Europe.
Here's a video I did.
PAR testing COB's- Vero 29 SE D-Series (4000k) - YouTube

Hey, can you also link a heatsink I can use for this led? Preferably from one of the websites you listed.

 

[Justwannagrow]

The 3500k 90 cri is the best full spectrum chip there is hands down. That's the whole point of the COB is to not need to mix the spectrums