The DIY COB Addiction

[Buckshot317]

I think tomula is going to use these ain't he seymore, I saw someone post a pic of these ?

 

[Peachapoil]

In theory, If a small cheap cpu cooler can cool cobs, a big expensive one can cool them too i think.

But i would make shure some air moving round it like in a computer case. How much watt its rated for? How do you want to mount it?

Rated 100w

 

[Lost In Nugs]

I just noticed there is a fan in the middle. Should be good. But mounting to a frame could be a pita, maybe this kind of fan would work on an aluminum plate.

I would pick Alpine 11 plus.

 

[Lost In Nugs]

I think tomula is going to use these ain't he seymore, I saw someone post a pic of these ?

Ah, now you say it, i think so buddy. I like the badass look of these somehow, i have a similar but slightly bigger one for my overclocked i5 4,4ghz quadcore... 68C under 100% power...would be overkill for a COB.

 

[Buckshot317]

Ah, now you say it, i think so buddy. I like the badass look of these somehow, i have a similar but slightly bigger one for my overclocked i5 4,4ghz quadcore... 68C under 100% power...would be overkill for a COB.

I'm thinking he is going to use them, I thought he posted pics a while back. As long as they dissipate enough heat they will work

 

[Lonestar11]

Following

 

[Peachapoil]

Ah, now you say it, i think so buddy. I like the badass look of these somehow, i have a similar but slightly bigger one for my overclocked i5 4,4ghz quadcore... 68C under 100% power...would be overkill for a COB.

That's why i wanted to use these, cheaper than pin fin passive heatsink in canada, my cousin run a i7 overclocked full load at like 70 c with a similar heatsink (i think it's corsair) and i could be able to pierce and tap to fit cob

 

[Peachapoil]

I'm thinking he is going to use them, I thought he posted pics a while back. As long as they dissipate enough heat they will work

Who is tomula ?
What thread ?

 

[JimmyJames905]

That's why i wanted to use these, cheaper than pin fin passive heatsink in canada, my cousin run a i7 overclocked full load at like 70 c with a similar heatsink (i think it's corsair) and i could be able to pierce and tap to fit cob

If you can tap it, it will work. But it's awkward to hang and shipping from china takes a VERY long time.

 

[AvidLerner]

One of my clients uses this heat sinbk with a citizen running 100v on a 2100B driver. Works fine

 

[Lost In Nugs]

Is there no other option? It is active, smaller active cpu heatsinks are cheaper and easier to mount on a frame. They can be pretty small when active and are cheap too

 

[Peachapoil]

Another question when iam looking at data sheet they give me few data on voltage, which one is the good one to use for driver calculation ?

Selection guide, pulsed measurement data ;
-bxrc-35g10k0-d-7x = 37.6v
-bxrc-35g10k0-d-7x- se = 37.6v

Selection guide, stabilized dc performance
-bxrc-35g10k0-d-7x = 36.6v
-bxrc-35g10k0-d-7x-se = 36.6v

Product performance at commonly used drive currents;
-bxrc-35g10k0-d-7x = 37.6v
-bxrc-35g10k0-d-7x-se = 37.6v

 

[Buckshot317]

Cutter has the artic or alpine active heatsinks, pretty cheap, I think they ship anywhere. Can't remember the name of them.

 

[Buckshot317]

The higher the drive current the higher the voltage needed to drive the current. Might as well figure 38 volts.

 

[AvidLerner]

Another question when iam looking at data sheet they give me few data on voltage, which one is the good one to use for driver calculation ?

Selection guide, pulsed measurement data ;
-bxrc-35g10k0-d-7x = 37.6v
-bxrc-35g10k0-d-7x- se = 37.6v

Selection guide, stabilized dc performance
-bxrc-35g10k0-d-7x = 36.6v
-bxrc-35g10k0-d-7x-se = 36.6v

Product performance at commonly used drive currents;
-bxrc-35g10k0-d-7x = 37.6v
-bxrc-35g10k0-d-7x-se = 37.6v

I would go with 36v stabilized voltage. Vf has stabilized starting at 37v and drops to 36 v as it warms up.

 

[AvidLerner]

Cutter has the artic or alpine active heatsinks, pretty cheap, I think they ship anywhere. Can't remember the name of them.

I think that is the pc style also available on ebay if in your area

 

[Buckshot317]

I never could get a definite answer on the voltage, so I played it safe at 38. I retired a few yesterday and put meter on output side. With 4 on a hlg240h-c1400b I max at 1.4ma, with 5 wired up I maxed at 1.21a. Tonight I'm going to test with light meter and see what the difference in output of the chips are. I'm curious to see what the difference is, also my chips are d series

 

[Buckshot317]

I did start reading some of fluence's material avid. So far good reading

 

[JimmyJames905]

I never could get a definite answer on the voltage, so I played it safe at 38. I retired a few yesterday and put meter on output side. With 4 on a hlg240h-c1400b I max at 1.4ma, with 5 wired up I maxed at 1.21a. Tonight I'm going to test with light meter and see what the difference in output of the chips are. I'm curious to see what the difference is, also my chips are d series

I'm curious too. I got a 170 micromole difference at 8"
Next build is 52v B chip. Two driven by a HLG 120h-c1400b

 

[Justwannagrow]

I've been looking at the lights on par horta and look nice and with buying I just wouldn't want 4000k or 1750k at all, just 3500k. Bit it won't give you an option.