need a good COB

[Thorhax]

I have 3 of these dual output drivers that I want to use. I was wondering which chip would be best for the drivers output. Here is a pic of it
I was thinking of hooking up two Vero18s to each even though they will run at 30watts. Would be cool if there was a better array I could use though

 

[bicit]

You could also use the vero 29 orthe cxa 3070 for a boost in power ddisplacement and efficiency. But it will be more expensive.

 

[Thorhax]

You could also use the vero 29 orthe cxa 3070 for a boost in power ddisplacement and efficiency. But it will be more expensive.

how do you know they will work with the drivers?

 

[churchhaze]

Both vero 29 and cxa3070 would work, but only at 650mA.

how do you know they will work with the drivers?

 

[churchhaze]

Vero 18 or anything with similar V-A characteristic is probably the best for that supply.

The remaining voltage could be dropped using monos at 650mA in series if you wanted.

 

[Thorhax]

Vero 18 or anything with similar V-A characteristic is probably the best for that supply.

The remaining voltage could be dropped using monos at 650mA in series if you wanted.

so is it safe to hook up 2 veto 18s to each?

 

[churchhaze]

Actually, the vero 18 might not work because of the 30V minimum. At 650mA, they'd probably drop more like 29V.

Maybe there's another cob between the voltage range.

Edit: You could use monos to drop a few extra volts dropped!! problem solved!

If you add just 1 XP-E photo red to the series string, it will drop enough volts to operate within the voltage range!

 

[churchhaze]

If you put an XP-E in series with each vero 18, it'd be safe, yes.

so is it safe to hook up 2 veto 18s to each?

 

[Thorhax]

If you put an XP-E in series with each vero 18, it'd be safe, yes.

how would i calculate the total watts being put out from the lights? would it be 180watts in total?

 

[Thorhax]

is there anything i could use by itself?

 

[churchhaze]

29V * 0.65A = 18.85W

For per channel so 113.1W electric dissipation for 6.

At 38% efficient, 43W of radiant power is put out from the lights.

how would i calculate the total watts being put out from the lights? would it be 180watts in total?

 

[AquariusPanta]

29V * 0.65A = 18.85W

For per channel so 113.1W electric dissipation for 6.

At 38% efficient, 43W of radiant power is put out from the lights.

Huh? I get the first line of math but the rest leaves me scratching my head. Care to share some brotherly insight Churchy?

Edited: After doing some personal math, I can decode your english.

You were trying to say 2x channels per driver, 3x drivers, which equals 6x connections for 6x Vero 18's, running @~650mA, with voltage around 30 or so. The math comes out to around 115W in some cases.

(For clarity): [Vero(29.5V * .650mA) * (2x channels * 3x drivers)] = ~115W

The efficiency though... still trying to decode the mysterious algorithm you used.

 

[churchhaze]

I used the mysterious power of multiplication.

0.38 * 113W = ~43W

The efficiency though... still trying to decode the mysterious algorithm you used.

 

[AquariusPanta]

I used the mysterious power of multiplication.

0.38 * 113W = ~43W

Right. Ok. Let me now clear my english for you to understand. The 38% variable. How come?

 

[churchhaze]

"At 38% efficient, 43W of radiant power is put out from the lights."

38% is a given because i said "at 38%".

Right. Ok. Let me now clear my english for you to understand. The 38% variable. How come?

 

[AquariusPanta]

"At 38% efficient, 43W of radiant power is put out from the lights."

38% is a given because i said "at 38%".

Right, but why not 100% or 420%? Why choose 38% arbitrarily? Obviously your withholding some information that you feel fit to introduce but not fully explain, something like that of your math.

 

[churchhaze]

The efficiency of your every day vero 18 3500k 80cri at 650mA is closer to 38% than 100% or 420%... lets just call it a hunch that efficiency is not 100% or 420% if you catch my drift. Then you'd be breaking the laws (of thermo).

If your efficiency is 39%, plug in 39%.

 

[AquariusPanta]

I have a feeilng the efficiency of your every day vero 18 3500k 80cri at 650mA is closer to 38% than 100% or 420%... lets just call it a hunch that efficiency is not 100% or 420% if you catch my drift. Then you'd be breaking the laws (of thermo).

If your efficiency is 39%, plug in 39%.

I would like to think you have more widespread knowledge and maybe even experience over these matters but I could be kidding myself. Only your participation, which has been gradually picking up, and demonstrations will overcome my doubt.

I sort of catch your drift but not entirely. So you are saying that, in short, even though a given Bridgelux Vero 18 may show ~30W actual on a meter, that, which matters most, the radiancy of the light, meaning the spectra of UVC to Infrared, may only be ~%40 while being ran at ~650mA, while the rest is quite possibly heat or some other form of energy? Or is this not the case?

 

[churchhaze]

Yes, exactly. If the light is 40% efficient and it takes 100W of electric power, it will give off 40W of radiant power and 60W of direct heat..

I sort of catch your drift but not entirely. So you are saying that, in short, even though a given Bridgelux Vero 18 may show ~30W actual on a meter, that, which matters most, the radiancy of the light, meaning the spectra of UVC to Infrared, may only be ~%40 while being ran at ~650mA, while the rest is quite possibly heat or some other form of energy? Or is this not the case?

 

[AquariusPanta]

Yes, exactly. If the light is 40% efficient and it takes 100W of electric power, it will give off 40W of radiant power and 60W of direct heat..

Do you believe the efficiency variable, 0-100%, varies due to the current that is discharged from the driver or do you think it's based off the materials used to build the light/COB/star and how well it was constructed?

For example, most legitimate drivers are advertised with efficiencies around 80 to 90 %. Also to include for consideration is the different BINs that some of the popular Cree COBs offer, with AB, I believe, being the best BIN type. It would seem that the quality of the BIN, such as AB, correlates with the potential radiancy efficiency of a given COB. Is this so?