Top bin COB comparison 2

Rocket Soul · Jul 14, 2016

Im partial to 6 vero29Cs on a hlg185c500 as main lights: should squeeze in w low current voltage around 66 volts per cob yielding about 33w per cob. Similar to 8 cxb on hlg185c700 but spending less than half on th cobs. Also as per bobby gs measurements: they look at least as efficient as cd bin, and thats measuring the d version which seems a little less efficient than c. Thinking 2x6 of those at 3500-4000k mix, and some extra 3000k for flower but run harder for penetration for a 4x4.

Airwalker16 · Jul 14, 2016

BOBBY_G said:
for the most part take a point on the chart and double/triple/quadruple the wattage

i.e 4 x 1825 would be 8.8 ppfd/W @ 160W instead of 140

what you propose gets expensive. 1212s are just cheap as heck tho.

5 of the 1212s are $60 and its destroying the $46 CXB3590... almost 2.5x the watts at the same efficiency

cost per watt goes way down and youre not stuck running your expensive CXBs at 20-50W/ea

So you're really saying that 1212's are much better than cxb3590's?

PurpleBuz · Jul 14, 2016

BOBBY_G said:
1212s are more cost effective/efficient, you say? hmmmm.....

View attachment 3732054

lol point taken.

but now we are back to big center lights with crappy distribution ?

JorgeGonzales · Jul 14, 2016

Airwalker16 said:
So you're really saying that 1212's are much better than cxb3590's?

In a 5:1 ratio.

3:1 is probably the fairest comparison price wise, with @robincnn promising $36 CD bin CXBs soon arriving. This is assuming $12 1212s, not sure what prices Bobby is using, presumably his own

BM9AGS · Jul 14, 2016

BOBBY_G said:
for the most part take a point on the chart and double/triple/quadruple the wattage

i.e 4 x 1825 would be 8.8 ppfd/W @ 160W instead of 140

what you propose gets expensive. 1212s are just cheap as heck tho.

5 of the 1212s are $60 and its destroying the $46 CXB3590... almost 2.5x the watts at the same efficiency

cost per watt goes way down and youre not stuck running your expensive CXBs at 20-50W/ea

Well we need to convince @robincnn to offer the 3x 1212 and blow the competition out of the water.....well until they copy him

Malocan · Jul 14, 2016

PurpleBuz said:
lol point taken.

but now we are back to big center lights with crappy distribution ?

hello,
not really, just depends how u space the cobs

JorgeGonzales · Jul 14, 2016

BM9AGS said:
Well we need to convince @robincnn to offer the 3x 1212 and blow the competition out of the water.....well until they copy him

Well he already has 1x1825

BM9AGS · Jul 14, 2016

JorgeGonzales said:
Well he already has 1x1825

Yes yes....I've been looking at those.

PurpleBuz · Jul 14, 2016

Malocan said:
hello,
not really, just depends how u space the cobs

takes more than that, needs ceiling height. ask @nevergoodenuf how much clearance he needs for even coverage for his oversized cobs.

Not saying one method is better than another, but there are tradeoffs.

JorgeGonzales · Jul 14, 2016

PurpleBuz said:
takes more than that, needs ceiling height. ask @nevergoodenuf how much clearance he needs for even coverage for his oversized cobs.

Not saying one method is better than another, but there are tradeoffs.

He meant, I believe, that there is no need to shove them all on one heatsink. Although 3x1212 or 1x3590 at the same watts, same difference. Maybe one makes more light, I don't know.

And Bobby already pointed out that individual heat sinks and optics would drive the cost up. Personally I like the extruded heatsink look.

churchhaze · Jul 14, 2016

You could run the big cobs low(ish) profile with 500mA/400V drivers! (sounds expensive though.. assumes 36V cxb3590 version)

They'd essentially act as super expensive cxb2530's, right?

PurpleBuz · Jul 14, 2016

JorgeGonzales said:
He meant, I believe, that there is no need to shove them all on one heatsink. Although 3x1212 or 1x3590 at the same watts, same difference. Maybe one makes more light, I don't know.

And Bobby already pointed out that individual heat sinks and optics would drive the cost up. Personally I like the extruded heatsink look.

understand, my comment was directed to your specific layout which saves $$ on individual heatsinks and lenses\reflectors. (one giant heatsink and one giant reflector)

nevergoodenuf · Jul 14, 2016

Actually, I can cover a 4'x5' area @ 18" with 2 COBs, but that is only with some strains, for some it's to intense @PurpleBuz. Even at 300 watts per COB, I can run at about 24".

BOBBY_G · Jul 14, 2016

BM9AGS said:
Gotcha....I could have figured it out if I used my brain. Basically 10 cxb 3590 at 10 watts each would crush it too.....and my bank acct

But 1212s are rocking for $60. Hmm. Are those reggies heat sinks?

PLC140mm

i used the existing CXB holes and drilled 4 more holes to mount 4 chips. then 2 new center holes for the 5th chip just cause

4 would do fine and gives you options to wire it up as full series/full parallel or a series/ parallel combo (2x72V in parallel)

BOBBY_G · Jul 14, 2016

Airwalker16 said:
So you're really saying that 1212's are much better than cxb3590's?

not on a 1-1 basis
but dollar for dollar its not even close.

even (2) 1212s for $24 beat the 3590 across the board, assuming heat sink costs are the same (or you have another $22 to spend on a separate (small) heatsink/holder/optics whatever setup and the dual 1212s put out more light than one cxb

BOBBY_G · Jul 14, 2016

JorgeGonzales said:
In a 5:1 ratio.

3:1 is probably the fairest comparison price wise, with @robincnn promising $36 CD bin CXBs soon arriving. This is assuming $12 1212s, not sure what prices Bobby is using, presumably his own

robins $36 deal is a short term promotion. pretty sure thats damn close to cost. without a cree hookup youre hard pressed to get them under $40 in 50 lots

JorgeGonzales · Jul 14, 2016

BOBBY_G said:
robins $36 deal is a short term promotion. pretty sure thats damn close to cost. without a cree hookup youre hard pressed to get them under $40 in 50 lots

Fair enough, I don't know the details. He just said $36.

Either way the 1212 is ahead at 2:1 according to your tests.

BOBBY_G · Jul 14, 2016

ill run 2-up/3-up/4-up/5-up

my gut is they will be exact 2/3/4/5 multiples of the 1 up, so yo can theoretically extrapolate multiple chips from single chip data

BOBBY_G · Jul 14, 2016

Airwalker16 said:
So you're really saying that 1212's are much better than cxb3590's?

another way to look at it is going back the cost efficiency chart, for the same chip cost of getting yourself into a 60% efficient CXB rig, you can get yourself to 70% with 1212s (or prob mid 60s with a vero V7)

CXBs are not "bad" chips at all, they are just overpriced relative to the competition at equal levels of performance. 3590s should really be less than what they charge for 3070s

nevergoodenuf · Jul 14, 2016

I may have found a new tool to help us, but it requires a log in and I don't have time for more passwords at the moment. So here you guys go.
http://www.ledsmagazine.com/ugc/2016/07/11/future-lighting-solutions-lighting-system-creator-ssl-design-tool-performs-over-20-000-lighting-simulations.html

Top bin COB comparison 2

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