Yep. Between 700ma(~25w) and 1000ma(~36w) will get you 170lm/w+. Depending how you cool them...1400ma can do it. Assuming the newer DB bins.Hi,
Cree's website states that the maximum efficacy for the 3590 is 174lm/w . Can someone tell me which MA this is at?
I'm looking at the "relative luminous flux" charts and calculating my lm/w based on that data but i'm wondering how are doing it?
Thanks!
Those measurements I posted are from a CD...not DB, so they are not lining up. But when you see it in the PCT you can side by side them. It would be a factor of 4.2 to be inline for DB...specially considering active cooling.just for fun when i multiply my recent ppfd sphere measurements by 3.8 for CXB DB on two different days (diff temps). seems to fall along same lines
my 2.4A measurement was a little higher than yours as it was aggressive active cooling and measurement taken before steady state
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so if that has basis it seems cobs can get to 180 lm/W at 10-15W and top 190 at 5W - but it seems we are at the practical limit there
@Greengenes707 do you think PWM would help those low current measurements push 200?
i actually realized that and went back and redid that post before i saw your response. isnt 4.2 a 10% bump? thats a bit more than i would anticipate from a chip spec upgrading from (presumably the higher range of) CD to (presumably the lower range of) DB. as midpoint bin to bin is like 7%. they do tout the recent 10% bump in efficacy but then we would expect every model to jump 1 bin minimum and 2 in some cases, no?Those measurements I posted are from a CD...not DB, so they are not lining up. But when you see it in the PCT you can side by side them. It would be a factor of 4.2 to be inline for DB...specially considering active cooling.
so on a standard dc voltage measurement between controller and diode is the the PWM invisible? and if so, how do you quantify overall input power?I use a storm controller and dim via PWM for all my testing. And then measure current and voltage while it going.
I get what you're trying to say, but just too much speculation going on there though. The PCT is based on steady state operation and min figures for the cx chips and is really accurate when accurate Tc's are used...like shown in the CD test. Those chips were bought from us a long time ago via fletch420...or something like that...and chilled gave him gen1 modules for the trade of info from what I can deduce. So mid generation CD's. He never went through with the side by side, or at least reported on it, and now we are looking at gen 2's. But it's the only, just chip test, and is right on with the pct.i actually realized that and went back and redid that post before i saw your response. isnt 4.2 a 10% bump? thats a bit more than i would anticipate from a chip spec upgrading from (presumably the higher range of) CD to (presumably the lower range of) DB. as midpoint bin to bin is like 7%. they do tout the recent 10% bump in efficacy but then we would expect every model to jump 1 bin minimum and 2 in some cases, no?
so on a standard dc voltage measurement between controller and diode is the the PWM invisible? and if so, how do you quantify overall input power?