sixstring2112
Well-Known Member
try a small flea comb maybe ?
COB efficiency Spreadsheets
- Thread starter nogod_
- Start date
Is there anywhere an explanation of all the different terms/columns above that i could read?Great Idea
Here is cxB3590 CB bin :
thanks
nogod_
Well-Known Member
First column is the drive current.
Fourth column is lumens @ 50°C
Fifth column is voltage @ 50°C
Sixth column is dissipation wattage @50°C
Seventh column is fourth column divided by Sixth column
8th column is the seventh column divided by the LER (LER is the maximum theoretical lumens per watt in this case 325)
Ignore the last column because prices are always changing
Fourth column is lumens @ 50°C
Fifth column is voltage @ 50°C
Sixth column is dissipation wattage @50°C
Seventh column is fourth column divided by Sixth column
8th column is the seventh column divided by the LER (LER is the maximum theoretical lumens per watt in this case 325)
Ignore the last column because prices are always changing
excellent, thanks mate
ttystikk
Well-Known Member
'On toast'
CobKits
Well-Known Member
in a given chip size, 3500 will always be brighter than 3000K
youre also looking at 4 different models of citizens there
watt for watt in a given color temp and CRI, the 1212s are about 10-15% less bright than the crees, 1812s are a little less bright, 1818s are a little more bright, and 1825s are about 10-15% brighter
youre also looking at 4 different models of citizens there
watt for watt in a given color temp and CRI, the 1212s are about 10-15% less bright than the crees, 1812s are a little less bright, 1818s are a little more bright, and 1825s are about 10-15% brighter
CobKits
Well-Known Member
That entire chart is the same chip at different currents. the softer you run it, the more efficient it is, but also has lower unit output for the same chip cost, so $/PAR W goes up
Oh man I'm an idiot. The dollars coming from chip cost vs light output. I was thinking more efficient, why would $ per PAR go up? Makes perfect sense now. Thanks for clearing that up.
Recommendations for drivers for these? I plan to run 4 of them at 700ma I think. Enough for a 2'x4' closet?
CobKits
Well-Known Member
so there still is no real basis for the low current measurements on those chips
in the chart above going from 1.4A to 0.7A: CXB efficiency increases from 56.34 to 64.01 (+13.6% relatively), which may be a little optimistic.
in supra's tests (https://www.rollitup.org/t/cxb3590-1500w.878136/page-35#post-12156936)
PPFD/W goes from 7.75 to 8.5 (+9.7% relatively)
in a few of my tests ive done:
DB bin:
9.53>10.56 +10.8%
8.81>9.80 +11.2%
8.80>9.70 +10.2%
CB bin:
8.19>8.99 + 9.8%
seems like 10-11% bump is more real world as compared to +13.6%. the 1% variation between sSupra's tests and mine could very well be methodology (his tests were more 'pulsed', mine are steady state which would bias low current data ever so slightly higher)- its still well into the 60s in any case
in the chart above going from 1.4A to 0.7A: CXB efficiency increases from 56.34 to 64.01 (+13.6% relatively), which may be a little optimistic.
in supra's tests (https://www.rollitup.org/t/cxb3590-1500w.878136/page-35#post-12156936)
PPFD/W goes from 7.75 to 8.5 (+9.7% relatively)
in a few of my tests ive done:
DB bin:
9.53>10.56 +10.8%
8.81>9.80 +11.2%
8.80>9.70 +10.2%
CB bin:
8.19>8.99 + 9.8%
seems like 10-11% bump is more real world as compared to +13.6%. the 1% variation between sSupra's tests and mine could very well be methodology (his tests were more 'pulsed', mine are steady state which would bias low current data ever so slightly higher)- its still well into the 60s in any case
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bassman999
Well-Known Member
I run 12 in a 2x4 tent in my closet, but not needed I am sure
Not sure there is a 700ma driver that likes 4 though
I think I would run 6 or more in a 2x4 in at 700ma
CobKits
Well-Known Member
there are all kinds of meanwell HLG-xxxH-C700B drivers, depends on your system size. each chip uses ~33.4V at that current
http://www.meanwell.com/product/led/LED.html
in any case despite its reputation its difficult to recommend the CXB for low current operation due to its cost as all chips perform great at that wattage. heres 5 chips performing within +/- 3% of the CXB at 23W. the chip below it is a $12 chip.
HydroRed
Well-Known Member
My lights were joining the "Flintstone Era" before I even got done with them haha
ttystikk
Well-Known Member
Mine aren't obsolete... yet.
CobKits
Well-Known Member
you aint seen nothing yet