COB efficiency Spreadsheets

SupraSPL

SupraSPL

Well-Known Member
factor 50C refers to the combined current and temp droop at junction temp 50C
lm85C refers to lumen output at junction temp 85C
lm50C refers to lumen output at junction temp 50C
vf50 refers to the COB forward voltage at junction temp 50C
50C diss W refers to dissipation wattage at junction temp 50C
50c lm/ watt refers to lumens/Watt at junction temp 50C
50c % refers to the efficiency at junction temp 50C
umol/s/W refers to the photos/second/dissipation W (PPF)
$/PAR W refers to the cost in USD for each PAR W
 
littlejacob

littlejacob

Well-Known Member
Bonjour
As always...who give the clearest answers...help everyone...and have an incredible patience...?
@SupraSPL
We should open a thread for people who want to thank him...it would be a veeeery long one...!
He helped more than half of cob users here on riu and some in other places too I guess!
I'd like to have a friend like him!
Have a great day ★
 
SupraSPL

SupraSPL

Well-Known Member
Thanks man, believe me I get more in return from all the Rollitupers. The designs many of us are using have come from the collective contributions from so many DIYers. We could have a thread giving credit for what everyone contributed. I have always been afraid to do it because I know I would forget many and probably credit the wrong person LOL
 
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otonogatobasso

Member
Guys, me again. I'm studying cree led lamps for a few weeks, and I'm beginning to understand things, but something still doesn't make sense to me. If I use cree's tool at http://pct.cree.com/dt/index.html and fill with CXB3070 with CB bin, I see the list with current (amps) and lumens, lumens/watts, watts, etc. But the smallest current shown there is 1.400. On the beginning of this thread, the third post someone posted a "spreadsheet" with lower currents as low as 0.7.

My question is: how did you get those numbers for 0.7 current? Are these spreadsheets only PNG images or is there a excel or something available for download somewhere?

Thanks
 
D

doz

Well-Known Member
otonogatobasso said:
Guys, me again. I'm studying cree led lamps for a few weeks, and I'm beginning to understand things, but something still doesn't make sense to me. If I use cree's tool at http://pct.cree.com/dt/index.html and fill with CXB3070 with CB bin, I see the list with current (amps) and lumens, lumens/watts, watts, etc. But the smallest current shown there is 1.400. On the beginning of this thread, the third post someone posted a "spreadsheet" with lower currents as low as 0.7.

My question is: how did you get those numbers for 0.7 current? Are these spreadsheets only PNG images or is there a excel or something available for download somewhere?

Thanks
Click to expand...
Top right of the page you linked, there is a drop down box for Current Range. Change that and you will have more options. I just put in CXB3070 w/ CB bin and was able to retrieve the numbers for everything.
 
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otonogatobasso

Member
Thanks. Let me try asking this question a third time.

Are the spreadsheets available on this thread only PNG images or is there a excel or something available for download somewhere? Thanks
 
SupraSPL

SupraSPL

Well-Known Member
I have only posted them as PNGs, cannot upload xslx unfortunately. Any suggestions how could I share the sheets? That would be especially important for the heatsink thread.
 
dionysus4

dionysus4

Well-Known Member
SupraSPL said:
I have only posted them as PNGs, cannot upload xslx unfortunately. Any suggestions how could I share the sheets? That would be especially important for the heatsink thread.
Click to expand...

link to google doc or smth? share through dropbox?

id love to have the xl version for efficiencies

heatsinks too
 
B

benbud89

Well-Known Member
SupraSPL said:
It is never perfected of course but here it is
Click to expand...
Wouldnt that have been nice to have earlier..... hehe, Thanks! Would it be silly for me to go 4000k instead of 3000/3500k ? I have a hard time finding threads with full 4000k grows. Rumors say, that they give frostier and less chunkier buds. That sounds great, since I live with an annoyingly high RH. Often >60.... It is hard to control, so less dense buds, might not be too bad.... Although it sounds stupid...
 
ttystikk

ttystikk

Well-Known Member
benbud89 said:
Wouldnt that have been nice to have earlier..... hehe, Thanks! Would it be silly for me to go 4000k instead of 3000/3500k ? I have a hard time finding threads with full 4000k grows. Rumors say, that they give frostier and less chunkier buds. That sounds great, since I live with an annoyingly high RH. Often >60.... It is hard to control, so less dense buds, might not be too bad.... Although it sounds stupid...
Click to expand...
I've heard from several growers that the plants seem to respond similarly from 2700k on up to 5000k. FWIW, popular choices are 3000k, 3500k and 4000k. I'm getting 3500k- and I'll be both vegging and blooming under them.

High RH isn't bad in itself; what you want to avoid is the rollercoaster, where it swings wildly every day. If it stays around 65% night and day, you're in great shape!
 
B

benbud89

Well-Known Member
ttystikk said:
I've heard from several growers that the plants seem to respond similarly from 2700k on up to 5000k. FWIW, popular choices are 3000k, 3500k and 4000k. I'm getting 3500k- and I'll be both vegging and blooming under them.

High RH isn't bad in itself; what you want to avoid is the rollercoaster, where it swings wildly every day. If it stays around 65% night and day, you're in great shape!
Click to expand...
Oh it swings a lot.... Summer is coming, and often that means thunderstorms in the afternoon/evening. And the heat in day time, means a low RH, 30-40% and 80-90% by night time. Sucks. It is really hard for me to deal with and I weekly have to throw buds with budrot away.... >.< it also means that I cant let my plants go through their entire harvest window of fear, so I cut a bit earlier than Id like....
 
ttystikk

ttystikk

Well-Known Member
benbud89 said:
Oh it swings a lot.... Summer is coming, and often that means thunderstorms in the afternoon/evening. And the heat in day time, means a low RH, 30-40% and 80-90% by night time. Sucks. It is really hard for me to deal with and I weekly have to throw buds with budrot away.... >.< it also means that I cant let my plants go through their entire harvest window of fear, so I cut a bit earlier than Id like....
Click to expand...
Gotta get that under control, it's the source of your budrot problems too.
 
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benbud89

Well-Known Member
I daily pray for no thunderstorms and rain, but apparently, Im not coming through. I know it is the problem, its a bugger. I will have to buy an AC, but I can only justify that purchase, if I make my grow area bigger..... xD
 
testiclees

testiclees

Well-Known Member
benbud89 said:
Wouldnt that have been nice to have earlier..... hehe, Thanks! Would it be silly for me to go 4000k instead of 3000/3500k ? I have a hard time finding threads with full 4000k grows. Rumors say, that they give frostier and less chunkier buds. That sounds great, since I live with an annoyingly high RH. Often >60.... It is hard to control, so less dense buds, might not be too bad.... Although it sounds stupid...
Click to expand...
I did a run with v29 4k. The flowers were chunky indeed but i didnt think the frost was so great. The potency though was + fine.

I experience high humidity through the summer and early fall. It hasnt caused me any trouble. But i avoid flowering during those times.
 
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