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Yes, degradation is still ridiculously low in comparison to 8x's. I decided to prolong the third step (551mW initial Po) to 10 hours total runtime. Just finished the last re-plot last night... I wanted to see if anything would change, preciselly because degradation was so slow. Either it...

I did some thinking and tried to see if i could interpret the available data in any useful way that would help, but i'm afraid the only way to really tell for sure how safe a certain power is, is to actually cycle the diode to death at that power. Because of the way degradation speed is...

I completed the second two hours of Step 3 today, at 385mA / 551mW. The diode is holding up well, but i realized some new things about how they work. First, here is the Step 3 "Zero-Hour" plot: Again, only a very small difference from before... Degradation Speed Comparison @ 385mA /...

I was getting ready to start the third step of the experiment, but instead of using the last re-plot from the last step for the new "Zero-Hour" plot, i decided to test again. Strangelly i got slightly different results this time. All that happened in between was, that i let the diode rest...

More good news! The second step of testing at 348mA / 498mW is complete, and the results look promissing again. It looks like this 12x is a tough diode... First, here is the second "Zero-Hour" plot: I left it together with the first one, because the difference is so small it would not...

I finally have some good news about 12x's! I finished the first step of the experiment last night, and the results were encouraging! Here is the Zero Hour plot of the diode i am testing: It's a VERY high efficiency 12x diode, from the very top of the efficiency group. I started by...

Well, me too, but it's too late now. And believe it or not, i actually feared i was testing too low for other's wishes... But the thing is, there was something very wrong with this diode from the start. Not only did it have an absurdly low slope efficiency, all it's characteristics were so...

I'm sorry for not posting about this sooner, but it really depressed me. I needed some time to figure out what to do... :undecided: In any case, i have some BAD news and some "good" news. That, and some weird observations about the bad news part.... I prepared everything so carefully this...

So i guess, since there are no complaints or different suggestions, we are good to go? How does 440mA / 564mW sound? My main concern here is making sure that 12x's are in fact tougher diodes than 8x's (and how much)... An 8x might last approx 50h at this power level, but if 12x's have the...

I only saw the 320mW Pulsed rating on Sharp's page before, and i didn't think much of it, because sometimes (but not often) the max Pulse power is rated at slightly more than double the CW. But if now both Nichia and Sharp classify 12x's as 320mW Pulsed, i really think we should re-classify the...

No, that's just the photo-transistor that detects the beam and triggers the counter in the Torture Chamber. It's an original part of the sensor i had to move out of the way slightly to expose the solar cell better to the light. The picture was meant to show how the sensor was upgraded. These...

Reserved for degradation update plots....

Thanks to everyone on this forum, there is a second 12x ready for the Torture Chamber. :bowdown: I will use this thread to post the results of the testing (degradation plots). I will also use this opportunity to show a comparison of all the 12x diodes i tested so far (one of them a Plextor...

Last re-plot was at 450 hours last week, here's the results: LG 8x #3 450h Data: Ith = 40mA Slope Efficiency = 1.088mW / mA Absolute Efficiency = 15.91% Avg. Po @ 300mA = 283mW = 79.49% of initial These are the latest Po over Time degradation plots: Degradation is at it's slowest so...

That's true, but the votes were for the old diode. Some later additions may be for the second attempt, cos i think the poll results changed a little... Not sure... :thinking: I don't know if this is even the right place to ask this question, i just realized this topic is in Off Topic for some...

Looks like my last post didn't take. I was having some trouble with my internet connection and couldn't get online for almost three days. But i was writing that before i finished testing the diodes anyway... Mostly i was just saying that i would also be happy with a 550mW test, but that i...

Yes, the one set to 453mW initial power went LED at just under 195 hours. 195 hours is a lot, and so is 450mW, so i'm impressed... I am 100% sure the 12x's are different from 8x's, because: 1. Their Vf is higher on average (the Vf curves form their own group above that of 8x's) 2. Their...

So the old diode reached 450 hours (i missed 440, i was sleeping :whistle:) and it still refuses to die! I stopped it for a re-plot, and to prepare the Torture Chamber for the 12x.

The trials can start as soon as i am confident enough about a good power to test. But believe it or not, the exceptional results with 8x's make it even harder for me to reach a decision that makes sense. :undecided:

360 & 400h LG 8x #3 Re-Plot: LG 8x #3 360h Stats: Ith = 40mA Slope Efficiency = 1.104mW / mA Absolute Efficiency = 16.18% Avg. Po @300mA = 286.5mW = 80.48% of Initial LG 8x #3 400h Stats: Ith = 40mA Slope Efficiency = 1.100mW / mA Absolute Efficiency = 16.12% Avg. Po @300mA = 285.5mW =...