HippieDudeRon
Well-Known Member
Why are you showing the Cree typical(middle) vs the other twos min(lowest)?
Migro Aray Confusion
- Thread starter Barristan Whitebeard
- Start date
hey guys. the question may sound stupid, but does the "LM281B" even exist? i mean without a "+"...i was always like the lm281b+ is an upgradet or slightly refined version of the LM281B...however, on the Samsung website i find nothing about a LM281B....only a Lm281B+ in a dozen variations. The only place where i can read"Lm281b" is on third party sites, mostly on Ali or Alibaba Sellers.
or maybe im just incapable of searching, but im at Samsung.com and this diode is not to be found in the 2835 department.
or maybe im just incapable of searching, but im at Samsung.com and this diode is not to be found in the 2835 department.
welight
Well-Known Member
Only data I have at this time
maybe a far strech to call this piece "data"
yeah i didnt even realize its typ vs min. Maybe at least mention it...Especially if its you...its got some...well "flavor" to it.
HippieDudeRon
Well-Known Member
Well...
-You posted the typical(SL) for the 301's already in post #12 in this thread.
- The PCT lets you input your own flux numbers anyways. There are a few ways to manipulated the PCT to show something and doesn't scream from the headlines of the charts, but using typical vs mins is really noticable and hard to swallow when your trying to show who is better.
-And I know personally the PCT has the typical for the 301. But that is an "internal PCT" and not really meant to be out here in the world showing crees internal data against other companies. Specially if manipulating it. Not a good look. Maybe there are difference in that policy globally, but would think they only want the customer facing ones being shown.
Anyways...
Lots of good chips, but top dog in every performance metric, other than cost, is the 301B/H. Evo's great performance but the cost premium is way too big on top of the normal 301's.
Crees new photophlly or whatever SPD will help Cree's cause, but still a touch behind samsung 301's head to head in performance.
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welight
Well-Known Member
It seems you are raising an issue about manipulating the PCT, not sure what PCT you have but the only input you can add is a target lumens target, if your suggesting I would manipulate the back end data to make some point ??. If you have access to the internal PCT, you can simply confirm my data by using the same data, confirmation is always a good look.
I dont have any dog in this, Im just running the sheet as I have it, would it be nice to have all typical or all min, yep it would but my version does not. I thought the real question was 301 vs 281, which are both the same min data, that does not mean I wont offer some data on Cree, thats my job, but its not related to the thread original question.
Cheers
do you have anything on the regular LM281B, without"+"?
welight
Well-Known Member
I have run it with different bins, does not state it, but looking at data I believe these will all be typ bins
this difference between std 281 and 301 explains price differences between the two in terms of fixtures I would suggest
Cheers
seems like at low current/power, the difference isnt that great, but the 301 can handle higher current with less efficiency loss. Im building a lamp with LM281B+ diodes right now...at full power each diode will only consume 160mw. I do think that a pretty good rank/bin there for the Lm301B.
Comparator
Well-Known Member
I feel 6" growing should be reserved for stacked lighting because it's far from an optimal solution. Especially non-diffused & less intra-canopy illumination.
i have my own theory about the efficiency results now. Shane is very familiar with his own testing methods obviously. Let me put it like that, if you made the measure more accurate, like 64 points of measurement instead of only 16 in th 2x2 tent, im pretty confident the results would suffer. Only 4 measurements per row, combined with that very low hanging hight...go figuere.
oh...i didnt even know there are so shitty Lm301 ranks...in the Samsung LED Component Calculator you only find SK to SM rank for 301B. I was already wondering, because there are so many LM281B ranks, but only 3 for the 301.
do these diodes look rectangle or square to you? Pretty square to me for sure...man if this are 3030 diodes while their website and their Youtube Acc. still claiming its Lm281b+ would be a good laugh. He said 3 times in the show its LM301B...how can somebody misspeak 3 times.
need a better close-up to be sure.
need a better close-up to be sure.
Attachments
man that LM281 would be the perfect diode for my DIY lamp...im running 6 QB288 on very low current, only 240 watt driver, but the max in reality is 200 watt. I wish the LM281B+ on my board had 202 lumen/watt at 30ma...they dont. Im running 41ma at full power.
But what i can see, that LM281 loses efficiency drastically with higher current. Thats more than any LM281B+ or LM301 rank, ive checked them all on the Samsung LED component calc. Or you could see it positiv, it gains almost 40% efficiency when going from 150ma to 50ma. Basically using 3 times as much diodes. Pretty insane.
sadly you cant find the Lm281B in the LED-Component Calculator anymore, only the Lm281B+.
HippieDudeRon
Well-Known Member
281B's are EOL'ed at this point. No longer supported. Now they have 281B+ as the standard, and the 281B+Pro as the premium for 2835's.