COB efficiency Spreadsheets

nogod_

nogod_

Well-Known Member
Tracking down Supras spreadsheets can be a pain. Lets all work to organize this info in a way that is slightly less caveman and less of a timesuck than this forum already is.

Post spreadsheets here!

Ignore the price/Parwatt as the prices of COBs are always changing! These tools are for calculating efficiency only; you determine your value based on what price you are paying for your COBs! Hope that clears everything up for anyone that is confused!

Also, please save the comments for another thread so we can keep this thing lean and sexy!

And lastly, thanks again @SupraSPL

Here are some other tools:

Cree PCT
 
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Randomblame

Randomblame

Well-Known Member
Hi Nogod!
Seems you have wrong datasheets for the Vero series. The old Vero29 delivers up to 3.500lm@0,7A(24,9w) at 50°C that's 140lm/w(146lm/w@25°c) and the new Vero series offers again 10lm more per watt(158lm/w@25°C). I think that means 43% for the old Vero29@700mA and up to 46% for the new one.
 

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youngbotanist355

Active Member
Has anyone done the pixel counting yet for the 3000k and 5000k Vero 29 ver 2's yet. Ive been playing around with the datasheets and have a rough idea of their efficiencies but something more concrete would be awsome. If not an engineering friend and i might get started on it
 
Doer

Doer

Well-Known Member
Very nice ya'll. Does anyone know the story of the invention of the first spreadsheet, Lotus? It was a couple of guys that were trying to represent data to each other and came up with the row/col/2 layer (data and instruction) approach.

They used it to solve their own engineering, what ifs. Then, the company they worked for got the patent and cut them out completely....but they kept their jobs.
 
Doer

Doer

Well-Known Member
nogod_ said:
CXB3590 [36v]

Click to expand...
There it is, in black and white, what I took a while to grasp. I was all for 1.4a driving current, but I saw my light.

Between .7 and 1.4a, you pay an extra $1.77/wPar to run low current,

But you gain slightly over 7% in efficiency. !!!! And you get ~12% more flux density.

You apply that extra $1.77 one time. And you get 7% per hour in Utility savings.
It won't take long, at all, until it pays for itself. And you have a good light for 50K hours.
And in 50K hours, you pay for the entire rig in energy savings over HPS.
 
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SupraSPL

SupraSPL

Well-Known Member
Doer said:
There it is, in black and white, what I took a while to grasp. I was all for 1.4a driving current, but I saw my light.

Between .7 and 1.4a, you pay an extra $1.77/wPar to run low current,

But you gain slightly over 7% in efficiency. !!!! And you get ~12% more flux density.

You apply that extra $1.77 one time. And you get 7% per hour in Utility savings.
It won't take long, at all, until it pays for itself. And you have a good light for 50K hours.
And in 50K hours, you pay for the entire rig in energy savings over HPS.
Click to expand...
And when you run the math further, a 7% higher efficiency number in this example represents 13.5% more light/W (7/51.7=.135)

Additional advantage that is easy to overlook, running at higher efficiency you get the same job done with less driver and heatsink cost. Less heat requires less heatsink on top of that. Good stuff :leaf:
 
SupraSPL

SupraSPL

Well-Known Member
These sheets are based on Tj 50C. If you happen to be running Veros soft, they are most likely running cooler than that. Even when I run them mid-hard I measure 2% temp droop and these sheet are applying a 4.33% temp droop across the board. Also worth mentioning, the 5000K Vero 29 2.0 did not get an increase in lumens.

Bridgelux Vero 2.0, typical figures, Tj 50C

Vero 10 Vero 13
Vero 2 10 13.png

Vero 18 Vero 29
Vero 2 18 29.png
 
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bicit

bicit

Well-Known Member
SupraSPL said:
These sheets are based on Tj 50C. If you happen to be running Veros soft, they are most likely running cooler than that. Even when I run them mid-hard I measure 2% temp droop and these sheet are applying a 4.33% temp droop across the board. Also worth mentioning, the 5000K Vero 29 2.0 did not get an increase in lumens.

Bridgelux Vero 2.0, typical figures, Tj 50C

Vero 10 Vero 13
View attachment 3393010

Vero 18 Vero 29
View attachment 3393011
Click to expand...
Seems the gains were more pronounced in the lower temp 2700k,3000k, and high cri chips.
 
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