Fanleaf's Huge 42 COB Array Build Plus Other Builds

[9lastic]

I gathered that

Do you know any alternatives for Europe?

 

[9lastic]

would this heat sink work as a passive solution?
https://www.arrow.com/en/products/lmh020-hs00-0000-0000061/cree

Or is there something less expensive again?

I'm looking at Arrow, and it seems like the prices, once shipped to europe, are very similar to mouser..

 

[fanleaf]

Cutter Electronice in Australia...They are much cheaper

 

[fanleaf]

would this heat sink work as a passive solution?
https://www.arrow.com/en/products/lmh020-hs00-0000-0000061/cree

Or is there something less expensive again?

I'm looking at Arrow, and it seems like the prices, once shipped to europe, are very similar to mouser..

Again there are better heatsinks for way less money. I'll be back in a bit.

 

[jimmyclone]

Hay fan,
I am building two 8 cob vero29 se panels. Each panel has 2 hlg240-1750's pushing 4 cobs a piece. Im running both dimmers in parallel to a pot.. Now i know a 50k pot is ideal, i ordered what i thought was a 50k, but turns out its a 350k pot. I think it should still be ok, but i wanted some second opinions b4 i fire it up..
Thanks in advance..
Cheers

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

 

[jimmyclone]

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

 

[fanleaf]

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

Very nice chip layout. Very good to see the chips pushed more towards the outside. Very very nice.
Yes, your pot will work but not very well. You will be at full power at 1/8 pot lol. Very very touchy. Grab another 50k ohm.

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[fanleaf]

Thanks bro. The best I could come up with is 2 parallel circumstances but it's cutting the current in half when I add the other two lights but keeping the voltage the same (or close to it)


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Jimmy. This is the series way. I didnt test it but off the top of my head it looks right

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[fanleaf]

To make it look a bit cleaner

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[jimmyclone]

Hay fan what about wiring in a resistor in front of the pot? Say a 300k resistor?? Would this work.. I like the pots i have as the come incased...
Cheers bud, thanks for the help

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

 

[fanleaf]

Hay fan what about wiring in a resistor in front of the pot? Say a 300k resistor?? Would this work.. I like the pots i have as the come incased...
Cheers bud, thanks for the help

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

No, that would make the lights go full power no matter where you turn the pot. For instance....If you need 50k ohms and had a 40k ohm pot and added a 10k ohm resistor that would work but would only dim to 20% and adjust to 100% with the pot. Adding more resistance in your situation is the opposite of what you need.
Adding resistance in series adds the sum of the resistors while paralleling resistors divides the resistance by how many resistors you have. You could parallel 6 potentiometers but thats rediculous lol. You need a different pot plain and simple. Its like starting a car with 20 drill batteries....it can start the car but not ideal.


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[jimmyclone]

No, that would make the lights go full power no matter where you turn the pot. For instance....If you need 50k ohms and had a 40k ohm pot and added a 10k ohm resistor that would work but would only dim to 20% and adjust to 100% with the pot. Adding more resistance in your situation is the opposite of what you need.
Adding resistance in series adds the sum of the resistors while paralleling resistors divides the resistance by how many resistors you have. You could parallel 6 potentiometers but thats rediculous lol. You need a different pot plain and simple. Its like starting a car with 20 drill batteries....it can start the car but not ideal.


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Thanks buddy.. That is what i thought but someone suggested it on another site.. I think i might just try the 350k as its already wired up and im going to have a digital current, voltage meter wired up... I know its not ideal and i will change it out.. But with these meters i should still be able to get to the wattage im after..

Cheers and thanks again

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

 

[fanleaf]

Thanks buddy.. That is what i thought but someone suggested it on another site.. I think i might just try the 350k as its already wired up and im going to have a digital current, voltage meter wired up... I know its not ideal and i will change it out.. But with these meters i should still be able to get to the wattage im after..

Cheers and thanks again

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

Thats the meters I use...work great

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[Buckshot317]

Almost everything I wire is parallel, about forgot series. I do remember in series your amperage is consatant, parallel voltage is constant. I basically came up with same drawing on dpdt switch. I couldn't find one at work to take meter to, that's easiest way for me to wire some switches and relays. I was hoping to have one to double check. I can't seem to upload pics at the moment.

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[fanleaf]

Almost everything I wire is parallel, about forgot series. I do remember in series your amperage is consatant, parallel voltage is constant. I basically came up with same drawing on dpdt switch. I couldn't find one at work to take meter to, that's easiest way for me to wire some switches and relays. I was hoping to have one to double check. I can't seem to upload pics at the moment.

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I have switches to test with but I'm just not gonna hook up a bunch of cobs and a driver to check it. I know it will work as long as I didn't overlook something just drawing it up in my head. I'm sure my drawing is good though ;-)

 

[Buckshot317]

I didn't mean hooking up cobs. I meant using meter to check terminals ( open and closed ). I found for me that's easiest way to make ladder diagram

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[TWINTURBODOGO]

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FNA bro nice truck!
I specially like that she's MOPAR and the big red C!

I have an 02 Ram quad cab 1500. Built a new short block with forged pistons and boost friendly. New trans to match, billet stall, fuel system to feed her hungry new cnc ported heads and cam. Last but not least will be the new turbo!

Should be test and tuning by mid spring just in time for the strip!



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[JimmyJames905]

To make it look a bit cleaner

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Thanks man. I did the same wiring last week but flipped the ground. I'll report back with results.
PS. Got my new par meter today.


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[JimmyJames905]

Hay fan,
I am building two 8 cob vero29 se panels. Each panel has 2 hlg240-1750's pushing 4 cobs a piece. Im running both dimmers in parallel to a pot.. Now i know a 50k pot is ideal, i ordered what i thought was a 50k, but turns out its a 350k pot. I think it should still be ok, but i wanted some second opinions b4 i fire it up..
Thanks in advance..
Cheers

9 Or 10 CKS Trainwreck Autos - First Time - Topped - Soilless

Make sure you test any pot before you buy it. I went to my electronics store and went through a whole bag of 100k pots...only found 2 out of 25 that were 100-104k. Looked at the Mil Spec carbons...not much better.


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[Buckshot317]

I'm waiting on 50 pots to come in, hopefully get 7 or 8 good ones

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