Will this work?

CobKits said:

and now that you understand that, go start at the beginning of this thread.

https://www.rollitup.org/t/matching-drivers-and-cobs.883866/

it should be fairly obvious how that spreadsheet at the beginning was derived. just remember when the spreadsheet shows 6.1 or 6.3 or 6.8 allowable cobs per driver - its still 6....if you can answer the question of why 6.1 is more ideal than 6.9 than you really have a good understanding of whats going on there

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CobKits said:

close. keep reading and thinking and ill tell ya tomorrow if you cant figure it out.

re: that last comment, look at the datasheets for any driver and compare efficiency at 70, 80, 90%. how different is it?

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CobKits said:

thats the one

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