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You might be waiting for a long time, i'm afraid. GGWs appeared as sleds approximatelly 10 months ago. And so far they are still holding their price. Well, it dropped a little recently, but it's still several times the PHR price... Hopefully our Chinese "friends" can get 8x sleds, since they...

Re: 12x Murder Fund! (Complete!) Larry dug up some charts showing the pulsed power requirements for different speed writers. Before that we didn't have much info on actual requirements... We've been guessing for a while that 6x's require 100mW CW / 200mW Pulsed. This seemed to be somewhat...

You can be sure i will... I'm just starting to wonder if the 8x's will die in time to start the 12x test. :crackup: Not that i want them to, but... I might have to cycle the 12x together with the second 8x.. :angel: Only problem is - i'd need another giant heatsink for that!

Can you show the plot you're talking about? The diode is already at 94% of it's initial power after 30h... If it goes on like this (and survives a drop to 90%) it will be at around 50 or 60h.

30h Degradation Plots Diode stats: Ith = 36mA Po @300mA = 334.5mW (= 93.96% of initial power - 364mW) Slope Efficiency = 1.264mW/mA Actual efficiency = 19.14% Peak / 18.88% Avg. I calculated the average efficiency from the data points where the efficiency flattens out - starting at...

Re: 12x Murder Fund! (Complete!) I think we all are, CJ... :yh: Anyway, does anyone have any idea as to how to test this thing? I mean with the 8x's we had some numbers - the currents people set them to, and there we are mostly testing how long the 8x's can survive these currents/powers...

We are reaching the 30h mark!!! :D I have to admit, i did not expect this. Not at 300mA with the weakest diode! I am very impressed by these 8x's! :yh: EDIT: We have reached the 30 hours of ON-time! :bowdown: Two pics... :yh The diode deserves a short break... :bowdown:

Re: 12x Murder Fund! (Complete!) High efficiency 8x's can be powered up to 500mW... However there i would not recommend it for reliability reasons (at least not until more torture is done). With a 12x, i would actually consider it! But then again, that's why we're gonna kill one, isn't it? To...

Re: 12x Murder Fund! (Complete!) Dave, i just saw your signature in another thread.. You should never have taken it out of that 12x sled you sent to me.. Then it would have already been here... :crackup: Anyway, this is bizzare, before i made a single post to this thread you guys already had...

Re: 12x Murder Fund! (Complete!) And indeed, when i plot Vf's alone, the 12x's DO stand out, and not just a little! The result is PRECISELLY what i would expect from a higher power diode - lower Vf's at the same currents! Looks like these really are new diodes. I already posted this plot in...

The reason i plot Efficiency (%) against El. Input Power (Pe) is, that efficiency shows how much of the input power comes out as optical power. Diode efficiency is directly related to electrical input power... If you read off the percentage at any point in the plot, and then calculate that...

Re: 12x Murder Fund! (Complete!) When i heard of this new fund yesterday, i wasn't too sure at first. I thought the 12x's were too similar to 8x's and that we do not yet have enough evidence to suggest otherwise. Then Dave tested an 8x in the same way he tested his two 12x's and the 8x did...

We want to squeeze as much info out of the two as possible. In an ideal world, i'd want to kill 20 at 300mA to establish some averages of how long they will live. And then kill another 20 at a higher current and another 20 at an even higher current, and so on, to create a chart of how long they...

I think they were 3 or 5 USD each. Or maybe EURO.. Not sure.. It's just an MCU that when turned ON records the time it's ON.. The reader cost a little more, but still not enough to say it was expensive. I just don't know how far the project ever went. The ones i have are prototypes. I wish i...

Good thing that for us, the "useful life" ends when the diode dies, eh? Our little diode already made it through 25h+ of ON-time! That's over 50h of torture (+ breaks, there have to be breaks so it doesn't develope tolerance).. This is already way better than my worst fears. They are tough...

Yes, i measured it at 363mW at 320mA... It started out at 382mW at 320mA.. It's quite a considerable drop there! Of course if i was cycled at 320mA the drop would have been higher, or worse, the diode dead.. I think it's already safe to say this diode won't get to see 100h.. But on the other...

Yes, i remember reading about that from another manufacturer, but it applies to diodes under normal operating conditions.. The way we overdrive them, they probably never get to degrade as much as to require 30% more current to reach the initial power. The most i've normally seen a diode degrade...

Ok, the 20h degradation plots... There was no obvious drop from 10 to 15 hours, but 5 additional hours of ON time left their mark... The difference does not seem larger than that from 10-15, even tho it's the result of 10h of ON-time (20h of cycling).. Anyway, attached are the plots, the...

Thanks for doing this, i'll have the results in a moment. Well, the different spread and of the data points does explain the crossing of the lines at the beginning of the efficiency plots. But after that the behavior of your tested 8x is identical to all the others - it follows the same...

No, i'm just doing it for "science"... :angel: The counter reached 1204! We are at 20 hours!!! I stopped the cycler for re-plotting.... Let's see what the diode has to say now.. :evil: