Old 02-22-2008, 02:35 PM #33
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Default Re: Optotronics RPL-375 review

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Originally Posted by Paolo60
80,000 hours lifetime expectancy...

Wow!!! But if i think... this isn't very important, for the reason that with duty cycle of 5 minutes on and 2 off (as reported by Jack) i need about 38 year full use 7/7 day on week and 8 hour for day (5.7 hours effective because of duty cycle): ridiculous !!! I have to push the on-button about 68 x2 times for day (2 because on & off). :P

Now i tray with 5000 hours lifetime expectancy and more reasonable use, even if however exaggerated: 2 hour for day and 5 day for weak, 10 month for year (may be physics laboratory use). Result 16 year. If MTTF is 8000 hours you have 25 year.

So... Is evident that the lifetime expectancy for normal use isn't a real question and must be irrilevant for the prices on portable laser as this.

About beam divergence... Jack write: <1.00mrad - typically <0.92mrad Well, i like <0.92 (most important that ridiculous lifetime expectancy) and i like more to see in certification sample image in Jack site: Divergence 0.752 mrad. Wow!!!

0.752 Divergence for my taste is more important that 20~30 mW more then specific. Because we can't see this excellent value (or at least < 0.92mrad "typically&quot in real sample as your?...

Is possible that manufacturing tollerance allow 1 sample on 1000 to have this excellent value? Mmmm... i don'know... maybe. Perhaps the question is: < 0.92mrad is for 4/5 of the sample of Optotronics? And 1/5 is from 0.92 to 0.99...

If this is true, because you sample is about 1.1mRad?

Ok, i hope that divergence for you isn't a problem (is subjective), perhaps for you is more important real power, and in your RPL 375 you have a lot of. Well... customer satisfaction is important.
Hi Paolo60,
I know my answers are late, but we've been very busy lately.
Many people don't understand what MTBF/MTTF really means.
An MTBF of 80,000 hrs or whatever the reliability rating of a component may be, is no guarantee that the component will last for that long. It's used by manufacturers to rate/predict the reliability of a large sample (1,000's) of components.

I just did a quick google search to provide a link that will describe this in more detail, here's the link.
http://www.bluemax.com/docs/Motherbo...Info/mtbf.html

Jack


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Old 02-23-2008, 11:04 PM #34
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Default Re: Optotronics RPL-375 review

Hey Jack, good to see you here again!
Any new color RPL in near future? I would love 2W+ IR RPL model.
Give us some teaser...
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Old 02-24-2008, 12:37 AM #35
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Default Re: Optotronics RPL-375 review

Quote:
Originally Posted by Milos
Hey Jack, good to see you here again!
Any new color RPL in near future? I would love 2W+ IR RPL model.
Give us some teaser...
Hehe, me too! I'd also like to see red (671, 660, 650, or 635 nm) and yellow (589 or 594 nm) lasers.

By the way, Jack, would you happen to know the standard deviation of the lifetimes of the RPLs?

(I'm taking a statistics class right now. ;D)
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