Reflectors Vero 29

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Durei

Member
Hello,

I am building 4 led bars with on each bar 4x vero 29 3000k driven at 1.4a. The bars are 120cm long to place each cob so that the light intensity is the same everywhere. This all wil be placed in a 5x5 tent. This would be 32w sq/f.

Initially I didn't want to mount reflectors but after a lot of reading I would like some more info. I've found multiple suppliers for reflectors but I like Ledil the most because they arent too big in dimensions.

I am just wondering what beam angle would be best in our application. The angles seem so narrow, wide is just 33 degrees, so I think the extra wide of 72 degrees suits my situation best.

Can someone help me out here? Thanks in advance!
 
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churchhaze

Well-Known Member
I know this wasn't what you were asking, but you should consider either making bars of 3x vero 29 at 1.4A or bars of 5x vero 29 at 1.05A.

You can't fit 4x vero 29 on an HLG-185H-C1400, only 3, but you can fit 5 on a HLG-185H-C1050.

4x vero 29 at 1.4A in series is sort of an oddball configuration with the drivers available. If only HLG-185H-C1400 supported 2-3V higher output voltage it would be able to support 4x vero 29 in series.
 
SupraSPL

SupraSPL

Well-Known Member
Ya I have come to realize our 115º 120º COBs do output almost 180º. So there is a lot of light to recover. You are correct 30º is too tight. 70-90 is probably good for most applications and I think we can come up with a rule of thumb based on the distance from canopy/dissipation wattage. @Greengenes707 might already have that sorted
 
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Greengenes707

Greengenes707

Well-Known Member
SupraSPL said:
Ya I have come to realize our 115º 120º COBs do output almost 180º. So there is a lot of light to recover. You are correct 30º is too tight. 70-90 is probably good for most applications and I think we can come up with a rule of thumb based on the distance from canopy/dissipation wattage. @Greengenes707 might already have that sorted
Click to expand...
I'm working on it a little still. I have a good base of testing. But only played with 2 angles so far from actual manufacturers. Then a bunch of DIY with a protractor. Seems that 75* to 90* will be the sweet spot for most based on materials, height and all that good stuff. 90* is prime imo and experience. Like supra said, our 115* cobs are closer to 180*...making the 90* a substantial improvement. My testing of reflectors has all be at 1.4a. So for you guys running <1000ma...it's probably a different world.

With a 90* reflector...what ever height the fixture is at....is the coverage away from center that the reflector should light up well.
So 18" high...will cover 18" outside the unit with good intensity.
And it hold true in use, though not perfect to the math, but very close.
 
D

Durei

Member
churchhaze said:
I know this wasn't what you were asking, but you should consider either making bars of 3x vero 29 at 1.4A or bars of 5x vero 29 at 1.05A.

You can't fit 4x vero 29 on an HLG-185H-C1400, only 3, but you can fit 5 on a HLG-185H-C1050.

4x vero 29 at 1.4A in series is sort of an oddball configuration with the drivers available. If only HLG-185H-C1400 supported 2-3V higher output voltage it would be able to support 4x vero 29 in series.
Click to expand...
Thanks for the advice, but I already have the drivers and everything else to build the light bars.
 
D

Durei

Member
Greengenes707 said:
I'm working on it a little still. I have a good base of testing. But only played with 2 angles so far from actual manufacturers. Then a bunch of DIY with a protractor. Seems that 75* to 90* will be the sweet spot for most based on materials, height and all that good stuff. 90* is prime imo and experience. Like supra said, our 115* cobs are closer to 180*...making the 90* a substantial improvement. My testing of reflectors has all be at 1.4a. So for you guys running <1000ma...it's probably a different world.

With a 90* reflector...what ever height the fixture is at....is the coverage away from center that the reflector should light up well.
So 18" high...will cover 18" outside the unit with good intensity.
And it hold true in use, though not perfect to the math, but very close.
Click to expand...
Thanks! So with the 73degree ledil reflector I'll be fine, it doesn't have to be that perfect. Ledil is actually the only manufacturer who builds reflectors that fit in the bars, all others are large/strange dimensions.
 
SupraSPL

SupraSPL

Well-Known Member
I think you will find that CH is right on. 4X Vero 29s at 1.4A would be about 150V, based on my own measurements of Vf. The HLG-185H-C1400 has a hard cap at 143-144Vf. So if you use 4 Vero29s, you would have to dim the string to about ~700mA, or the driver may reduce the current on its own to about that level.

I suspect the easiest fix would be to run 3 Vero29s on each bar unless you could swap out the drivers for HLG-185H-C1050 and run 5 Vero29s at 1.05A on each bar.
 
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churchhaze

Well-Known Member
It's the cobs that will reduce the current. When the driver reaches max voltage, it acts as a voltage source with protection (it won't allow the diodes to draw more than 1.4A).


I have 4 vero 29 running this way. When warm, 4 vero 29 on a HLG-185H-C1400A undimmed draws about 1.1A. Obviously I wouldn't purposefully design a setup like that again.

SupraSPL said:
I think you will find that CH is right on. 4X Vero 29s at 1.4A would be about 150V, based on my own measurements of Vf. The HLG-185H-C1400 has a hard cap at 143-144Vf. So if you use 4 Vero29s, you would have to dim the string to about ~700mA, or the driver may reduce the current on its own to about that level.

I suspect the easiest fix would be to run 3 Vero29s on each bar unless you could swap out the drivers for HLG-185H-C1050 and run 5 Vero29s at 1.05A on each bar.
Click to expand...
 
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dandyrandy

dandyrandy

Well-Known Member
I have finally ordered 4 vero 29's 3000 and 2 5000 k. I ordered mean well drivers and some reflectors with lens on amazon. Arctic 11 coolers. Dimming drivers. I have been using $100 panels. 180 w actual times 4 in a 40 X 46 area. I've been pleased. Let the test begin.
 
D

Durei

Member
Im in the Netherlands and parts for cobs arent that available. I ordered the vero's at digikey and had to pay 100€ tax, so I decided i just run 16 lpc-60-1400 which i could get in the EU. Made a nice driver board for it and will be hung outside the tent. I know there are a lot of wires now but I'll bundle them :cool:
 
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churchhaze

Well-Known Member
If you assume the voltage was max, 143V, and multiply by 0.95A, you get ~136W. Divide 136W/150W and you get ~90.7% efficiency

That tells me it must have been at max voltage since that efficiency sounds about right.

Greengenes707 said:
I've put 4 cxa's on a hlg185-1400...it was only ~950ma through the string. I forgot to check the voltage at the time...but the draw was ~150w at the wall.
Click to expand...
 
D

Durei

Member
Maybe the wrong place to ask this question but since it was my own thread I'll just post it here :p

Is it possible to wire 4 of the lpc-60-1400 drivers in parallel? When in parallel the voltage out remains the same but amperage will be 4x1.4a=5.6a. When I wire 4 vero 29 in parallel aswell, they all will get 5.6a/4=1.4a.

I want to wire it this way because then i only have 4 wires from the driver board instead of 16.

Can someone tell me if this is possible or not?
 
alesh

alesh

Well-Known Member
Durei said:
Maybe the wrong place to ask this question but since it was my own thread I'll just post it here :p

Is it possible to wire 4 of the lpc-60-1400 drivers in parallel? When in parallel the voltage out remains the same but amperage will be 4x1.4a=5.6a. When I wire 4 vero 29 in parallel aswell, they all will get 5.6a/4=1.4a.

I want to wire it this way because then i only have 4 wires from the driver board instead of 16.

Can someone tell me if this is possible or not?
Click to expand...
Possible, but...
Don't do that, each Vero has different voltage resulting in different current flowing through each COB.
 
D

Durei

Member
Why does each vero has different voltage? And arent the differences very very small between the cobs?
 
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JavaCo

JavaCo

Well-Known Member
Durei said:
Why does each vero has different voltage? And arent the differences very very small between the cobs?
Click to expand...
They can very quite a bit especially if you are running different colors. But they can be pretty close if you the same color and they are from the same batch. Even so Running in parallel can cause current hogging. Bridgelux does not recommend running Veros in parallel

 
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rocho

Well-Known Member
churchhaze said:
It's the cobs that will reduce the current. When the driver reaches max voltage, it acts as a voltage source with protection (it won't allow the diodes to draw more than 1.4A).


I have 4 vero 29 running this way. When warm, 4 vero 29 on a HLG-185H-C1400A undimmed draws about 1.1A. Obviously I wouldn't purposefully design a setup like that again.
Click to expand...
hi, the same thing may happens using the newest VERO29 gen.7?
I have just see on Cree tools that at 60° cxb3590 has only 4% better efficency than cxb3070(top bin).
No data about vero29gen7 at more than 25°C but that may show lower V so for example a Vero 29 at 60°C will run at 35V.. driving it at 1.4A also eith not consider a little tolleranche from MW driver should be fine...am i wrong?
Also if not, why should you run at 1.1A if driver automatically give less ampere if too many Volts?(for example 1.35A)
 
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